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00:01
5
Q: Focus on one of the two and the answer will come to you

Prim3numbahFive directors are listed in the puzzle below. There is an additional director who didn't make the list, the one labeled as "(Extra)". Who is that director? You can't fly but you can always try. Just make sure it's off the shore. If you can't, you'll land on water - no harm..., always works like...

8
Q: Is a facet always a maximal area section of a simplex?

Fedor PetrovLet $T\subset \mathbb{R}^n$ be a fixed simplex, $H\subset \mathbb{R}^n$ be a variable affine hyperplane. Is it true that the maximal area (i.e. the $(n-1)$-dimensional volume) of $T\cap H$ is attained when $H$ contains a facet of $T$?

4
Q: Reasoning Behind Individual Airspace Designations

Rocky ScottIs there a site that explains the reasoning behind each individual airspace designation? I ask this because the sectional chart shows a 6 NM radius area centered at about 40°22'30.0"N 77°37'30.0"W where class E airspace begins at 700 feet. Neither the sectional chart, nor Google maps, nor Bing m...

2
Q: How meaningful is the notion of now here on Earth?

EcologiteFaciesso special relativity and the lack of a now moment is causing me a bit of grief. How meaningful is the notion of now here on Earth between each of us? does the lack of an objective now moment in anyway change how we should think about our friends and family and philosophy between the relationship...

00:23
3
Q: StreamPlot ignores some options

lemurmanI am trying to plot some vector fields using StreamPlot, but I am unable to get the desired plot as some options are ignored when I add them. Here is the vector field I am trying to plot: \[Alpha] = Pi/4*(x + y); Q = {{Cos[\[Alpha]], -Sin[\[Alpha]]}, {Sin[\[Alpha]], Cos[\[Alpha]]}}; And here is ...

1
Q: Placement of reminder/courtesy accidentals

DjinTonicI recently downloaded Camille Saint-Saëns' lovely Valse nonchalante—the Durand First Edition (1898)—from IMSLP. All the upper-staff reminder accidentals are placed above the staff. I don't remember seeing this style before. I don't have that many Durand scores, so I don't know whether they've mai...

1
Q: How do I point the mkdir to the Desktop using bin/zsh? I am on macOS $HOME

DeniseHow do I make this create the directory on my Mac desktop rather than the home folder alone. mkdir -p "$HOME/${digits}_${date}" Right now it goes to /Users/name/ I need it to go one more folder to the Desktop.

00:38
4
Q: Why does 'tropical' mean 'figurative'?

zenoI came across the word tropical in a context which seemed nonsensical but, according to Merriam-Webster, the word can mean 'figurative' or 'metaphorical': tropical: ... (2) figurative (M-W sense 2: 2a: expressing one thing in terms normally denoting another with which it may be regarded as anal...

4
Q: Why are Capital punishment methods so difficult to institute?

Eliot G YorkI have found it perplexing to understand that Capital punishment often struggles to craft a method of execution that is effective, reliable and procurable. In history I believe that lynching, firing squad, electrocution are generally regarded as cruel and crude. Lethal injection however seems to ...

TeX
TeX
4
Q: Drawing a diagram showing a relation between two sets?

MikasaThe following diagram is given: I tried to draw it using table environment, but could not insert the skew arrows properly! Customizing this useful answer, I reached to: \documentclass[a4paper,12pt]{book} \usepackage{tikz} \usepackage{graphicx} \usetikzlibrary{positioning} \begin{document}...

00:57
2
Q: Calculate (without bruce force) probability that Diana leaves at the same time as AT LEAST one of her brothers?

user1109365 Diana is going on a school trip along with her two brothers, Bruce and Clerk. The students are to be randomly assigned into 3 groups, with each group leaving at a different time. What is the probability that Diana leaves at the same time as AT LEAST one of her brothers? Let there be groups $A,B...

GIS
GIS
01:22
1
Q: In QGIS, how can I split line buffers into two separate polygons?

JohnnyJohnsonIn QGIS, I have a layer of numerous vector lines that need to be buffered. Once they've been buffered, I'd like to have those polygons split into two, with the original line being the segment that splits them. This also needs to be done with a vector layer that has roughly 10,000 lines in it, so ...

4
Q: How does "if p, then q" compare to "p only if q"?

MarshaHow do the statements if p then q and p if only q compare

01:54
4
Q: Is there a word for 'cities with tall buildings?'

HeartspringIs there a word that can be used to refer to cities with several tall buildings? There's an adjective, skyscraping, but that feels a little figurative- I wouldn't say Hong Kong is a skyscraping city; it seems a strange way to put it. Is there another word, a noun, that would fit better in the exa...

2
Q: What to do if a grant proposal was rejected by a reviewer making false claims and using strawmen?

MarioBeing an experienced reviewer, and having received a host of rejections (and accepts as well), I know that rejection can be frustrating, even annoying, but also nice, fruitful, in some cases a good learning experience. There are many kinds of reviews (good, bad, constructive, opinionated, short, ...

2
Q: Working with Map<String,Object> and Parent Records

thinkerGood morning/afternoon/evening, I'm working with some code I got from GitHub to generate a CSV from a List<Sobject> someQuery However, it doesn't do well with parent records (i.e. Donor__r.FirstName) I need to be able to loop through the values in a JSON object that has parent records in at as we...

02:07
2
Q: Could a submarine 'sail' the ocean currents?

wokopaA sail generates propulsive force by the difference in pressure on the concave and convex sides. This principle of fluid dynamics should be true of seawater as it is of wind. And the seas do have currents, including predictable permanent currents. This got me thinking, could a submarine deploy an...

1
Q: wp_redirect() doesn't work

Asmat AliI am inserting a piece of code to my website that includes a redirect statement. Everything works fine except the wp_redirect();. The following warning message appears. Cannot modify header information - headers already sent by (output started at /home/xyz.com/b14_32999707/htdocs/wp-includes/clas...

Law
Law
02:24
2
Q: GDPR - Are technical identifiers personal data?

kolI've built devices for an internet service provider company (in EU) to measure internet speed at subscribers' home. The devices are used by company technicians when fixing network speed problems reported by subscribers. For every measurement the devices store the location and the time of measurem...

DIY
DIY
2
Q: Attempt to locate buried sewer line with melted snow?

Oily TexI live in a housing addition (built 1965-1980) in the barren (no trees) Oklahoma panhandle. The first thing the new home owners in this area did was plant as many trees as possible. Over last several years in my neighborhood many of these house sewer lines out to the alley main line are being dug...

CS
CS
2
Q: Why does William Nordhaus' preferred discount rate differ from that of the Heritage Foundation and the 2003 OMB?

Philip MeyerWilliam Nordhaus, the designer of the DICE integrated climate and economic model, in the most recent estimate I can find, suggests a discount rate of 4.25% per year: With the current calibration, the discount rate (or, equivalently, the real return on investment) averages 4¼% per year over the p...

1
Q: How do you introduce footnotes in a comic book?

SayamanHow do you introduce footnotes in a comic book? Let's say one of the characters play with an electrical toy inside a bathtub filled with water. How do you add the phrase "This is dangerous. Do not attempt this at home." with a star. I've never seen it done in a comic book, so I am not sure how to...

02:54
6
Q: How to replace selected elements of a list of rules with another unbalanced list of rules

Tugrul TemelI have two lists of rules: aa = {1 -> {5, 2}, 3 -> {2, 2}, 4 -> {2, 3}, 5 -> {1, 2}, 6 -> {1, 1}, 7 -> {2, 1}, 8 -> {1, 1}}; newVnames = {1 -> "EGW", 2 -> "MA2", 3 -> "HLT", 4 -> "AGF", 5 -> "WHS", 6 -> "TSC", 7 -> "CO12", 8 -> "FIN"}; List aa has 7 elements, while newVnames has 8 (unbalanced l...

2
Q: Is it possible to book a specific seat on DB trains?

JohnEyeI'll be traveling on an ICE train next week and plan to work during the trip, so I'd really like to have a table to put a laptop on. However, when I go to bahn.de and try to book a place to sit, all I'm presented with is the following dialog with no option to pick a specific seat: However, I've ...

03:10
1
Q: Using BRE and ERE in awk

VeakHow does awk distinguish between use of BRE versus ERE ? For sed there is the -E option one can use.

03:23
1
Q: Matrix representation of any conditioned gate

Марина ЛисниченкоIs there an algorithm explaining how to represent any gate in the matrix form? Suppose, the circuit is the following: where operator $ U = e^{iA\pi/4} = \begin{bmatrix} 0.35-0.85i & -0.35-0.15i \\ -0.35-0.15i & 0.35-0.85i \end{bmatrix} $, and the final CU operator has the following matrix repr...

CS
CS
1
Q: Why light can't escape a black hole but can escape a star with same mass?

Vitor 0101fI'm new to astronomy and was wondering why light can't escape from a black hole but can escape from a star with the same mass. In theory, the gravity of a star 100x the mass of the sun, and the gravity of a black hole 100x the mass of the sun are the same, so why can light escape from the star bu...

2
Q: Boxes and dice game

ComputersYou have $9$ boxes numbered $1$ through $9$ and then you have two $6$-sided dice. Each turn you roll the two dice and deduct the sum of the dice from the boxes by removing the number itself or any combination of boxes that sum up to the sum of the dice. For example, let's say you first roll a $4$...

03:45
2
Q: How do qualified dividends get a lower tax rate than ordinary dividends?

WGroleauIRS Form 1040 instructions say that "qualified dividends" have a lower tax rate than ordinary. Yet they are included in the ordinary and added to everything else for the ordinary rates. What am I missing?

1
Q: How to write straight on blank paper?

user207141My handwriting is very bad on unruled paper. How I can learn to write straight and nice on blank paper?

TeX
TeX
04:05
1
Q: Writing a class file from scratch and getting "Missing \begin{document}" error

MetomorphoseI'm looking to write my own class file for a couple of reasons, but my main interest is better understanding LaTeX and how it works. I understand that I likely don't need to define my own class for whatever I want to do, but I'm interested in learning the A to Z on what a LaTeX document needs in ...

DIY
DIY
6
Q: Why am I getting shocked touching an outdoor faucet?

George AndersonThis is going to be one of those "ask a question and provide your own answer" which I believe is allowed here. Here goes, hopefully it's allowed: In a farm setting, my brother asked me what could cause him to get a shock from an outdoor hose bib at the pump house? He was prepping for freezi...

2
Q: Methods to move supermassive black holes?

Emma FernandezThere is an advanced civilization that need to move the supermassive blackholes (SMBH) of their galaxies. I have seen some similar questions on here but the ones I have read are for moving much smaller black holes. I am not sure if you can charge a supermassive black hole enough to move it that w...

CS
CS
04:41
5
Q: Is rigged Hilbert space generally considered the correct structure for QM?

EE18I am currently reading the quantum mechanics text by Ballentine and, over and over, arguments are made (e.g. Chapter 4.6 on constraining the wavevectors of free particles to be real) which rely on rigged Hilbert space as the "correct" context for a quantum theory. Is this generally accepted as tr...

2
Q: Meaning of Pratchett's quote about coffee from "Thud!"

DaraanTerry Pratchett wrote in Thud!: Coffee was only a way of stealing time that should by rights belong to your slightly older self. I am struggling to understand the meaning of it. Is it pro/contra coffee, nothing of that sort?

Law
Law
2
Q: Employee acting illegally on direction from management

pauljI thought of this when reading the Meta case regarding negative testing. Say a state has a law regarding data-retention of log files for banks. A manager instructs an employee to wipe drive of logs. The employee is knowledgeable enough to know that this log, it is for data-retention, but they do ...

05:14
3
Q: Planetary simulation in python

HaleI have created a program in python that calculates forces between bodies (i.e earth, moon and a hypothetical moon) and make them move according to the changes in velocity and forces. This is the code for the program: from math import sin,cos,sqrt,atan2,pi import pygame pygame.init() class Planet...

DIY
DIY
05:25
1
Q: Would screens on my attic vents prevent the recurrence of termites?

Jason D5 years ago I had a termite company use Termidor and than Borate in our attic. With a new inspection they have found a few swarmers, but no evidence of additional damage. Would adding screens to the vents be a good idea? They also recommend to re-apply the Borate. Would that be a waste? Thank ...

CS
CS
2
Q: Why do we need a unit vector?

arya mukasyafI am taking a course in dynamic mechanics. It includes a lot of vectors. A Vector by definition has a direction and a magnitude, I don't get it on why we have to find a unit of it to find the direction of a vector. Could you also please give an example in which where it would be useful? Most of m...

06:08
3
Q: How to remove the pin on the lower end of the shift cable, to replace the derailleur

nightriderI need to replace the rear Shimano XT 7100 derailleur what broke in two at the base. It is attached by the single screw only but there is a metal pin fitted over the tip of the gear shifting cable. This pin is too thick to pass through the tiny hole in the derailleur where the cable runs through....

Law
Law
2
Q: In the USA what state's laws do I have to abide by when rafting on a river boundary?

dsollenLets say I'm rafting in a river that marks the boundary between state A and B. While in said river I perform an action legal in state A but not in state B. I want to know if I broke the law. How do I know which state's laws apply? Is it based on whether I am closer to one state's side of the r...

CS
CS
06:22
5
Q: Did Napoléon Bonaparte ask his wife Josephine not to bathe for several days in a letter before his arrival?

EpicBroccoliAccording to British historian Andrew Roberts, Napoléon Bonaparte wrote a letter to his wife Joséphine, in which he wrote "to her, ‘don’t wash for three days’" to spice up their reunion. This seems to be a common story also found in many other sources such as blogs and this popular science book o...

06:45
2
Q: If someone was suddenly subjected to a vacuum would they sh*t themselves?

WoliIf someone has the magical ability to make a vacuum(no or minimal matter/atmospheric pressure) on earth around someone would that person in the vacuum then sh*t their pants? If so would it have to be a perfect vacuum? A small bit of background. This would be like a spell or magical ability someon...

2
Q: Meaning of resistor power rating

DYNAMICSI am struggling to understand the meaning of the power rating of a resistor (e.g. 2 Ω, 40 W). How may this power rating impact the discharge performance of a battery whose terminals are connected to the resistor?

Vi
Vi
1
Q: How can I create mappings to execute specific Vim commands, depending on if a makefile exists?

user45331In general, I have makefiles setup anytime I'm working on C projects. To save and compile these projects, I've bound the ' key to do this: map ' :wa<CR>:!make<CR> However, I sometimes open up test files that don't have a makefile, and want to compile those quickly as well: map ' :wa<CR>:!gcc % -o %

CS
CS
07:13
1
Q: How do non-periodically varying currents produce electromagnetic waves?

JosephSandersSo electromagnetic radiation is created by the varying/accelerating of a system of charges and currents. Suppose that the time dependence of the charges and currents are $\rho(x,t)$ and $J(x,t)$. Then the subsequent radiation will have the same time dependence. In Jackson it is stated that we can...

07:23
1
Q: Advancements in formal logic in the 21st century?

NicolinoI've recently learned a lot about the history of formal logic, from Frege and Pierce in the late 19th century, to Russell, Hilbert, and Quine (et al)'s development of 1st-order logic, to advances with modal/non-classical logics (by Kripke, Hintikka, and Boolos), in the 70s, 80s, and 90s. However,...

TeX
TeX
1
Q: Organizing a very large equation in boxes

LinI have a very large equation that is collapsed in a very small notation. Something like f := a + b + c where a = a_1 + a_2 + a_n and a_1 = a_11 * ... and that goes on and on in a very large and not so simple equation/notation. The equations are really not important in my question. I would like t...

07:41
3
Q: Double integral over general regions between 2 curves.

hellwraizUsing a double integral, how do I find the area enclosed by the curves $y=x^2/2$ and $x=y^2/2?$? I got as far as $\int_{0}^{2} \int_{y^2/2}^{\sqrt{2y}} dx dy$, but I can't get any further, since I don't understand what do I integrate in that case. is it 1 or y? or even x? Or did I do everything w...

07:57
4
Q: Prove linearity of integration

David G. StorkI'd like to prove the linearity of integration over one real variable ($x$). Integrate[f[x] + b g[x], x] == Integrate[f[x],x] + b Integrate[g[x],x] which I was hoping would return True, but doesn't. I've tried all manner of assumptions (e.g., $b \in \mathbb{R}_{\geq 0}$), without success. Is th...

4
Q: Novel about a girl who reincarnates after being killed by her father and a treasure related to a phoenix

Manou LaIt's the story of a girl that got killed by her father because of her step sister, and a treasure related to a phoenix. She get reincarnated in the same world in the body of a girl with missing parents, then she went looking for her parents and her brother and she tamed the 4 mythical beasts. I a...

08:15
6
Q: Do we need to repeat the bed in procedure for disk brakes after replacing only the pads?

olliebulleI know that we need to go through the bed in procedure when installing a new disk, but what about when changing only the pads? Technically, the surface of the disk has already been prepared with the original bed in procedure, but I was wondering if there would be reasons to repeat it. Maybe that ...

2
Q: Where is the source that one is supposed take out their peyos when they are davening Shemona Esrei?

Lanied SofeyThere have been many times where I have seen people pull out their Peyos right before Shemona Esrei. Anyone I have asked said there is a source, but I can not locate it. (Supposedly there is a Yesod Vshoresh HaAvodah that mentions it).

08:31
2
Q: Finding the total number of objects(stones).

user5210I have $N$ stones. Then the stones are arranged in ascending order of weights. If I remove three stones that are heaviest, then the total weight of the stones decreases by $35$%. Now if I remove the three lightest stones, the total weight of the stones further decreases by a factor of $\frac{5}{1...

3
Q: Least squares problem penalising the number of non-zero coefficients

fesConsider a constrained least squares problem of minimizing $(y-X\beta)^T(y-X\beta)$ subject to a constraint or penalty on the number of non-zero coefficients $\beta_i$. This seems related to LASSO or Ridge regression but is different from either of these. It seems also related to AIC/BIC type cri...

08:48
2
Q: Why did this code make an error when drawing the function image? How to modify it?

csn899ClearAll@f; f[x_] := 2 Sin[x] - x - Log[x + 1] Manipulate[Refresh[functions = Table[D[f[x], {x, n}], {n, 0, nMax, 1}]; orders = Table[D[f[x], {x, n}] // Inactivate // TraditionalForm // ToString, {n, 0, nMax, 1}]; labels = MapThread[#1 <> " = " <> ToString[#2, TraditionalFo...

RPG
RPG
09:00
5
Q: If you manifest Fission, kill yourself on the last round, and revive yourself with psionic revivify next round, is your Fission duplicate permanent?

alexstrasa82"If you die, your duplicate remains in existence, and is for all intents you, but with two negative levels. (Once the duration expires, one of the negative levels immediately converts to one lost level; the other negative level can be removed by standard means.)" So if I Manifest Fission Wait un...

09:17
1
Q: Which musical form is a Trez(z)a?

KarloConsider the Intrada con Trezza in D minor by J.H. Schmelzer. The score has two movements: Intrada followed by Treza. I wondered whether a Trez(z)a is some kind of musical form (like Menuet etc.).

3
Q: The union of all conjugacy classes of a subgroup is not the group.

Henry T.Let’s consider a finite group $G$ and a subgroup $H \subsetneq G$. I have to show that: $$ \bigcup_{g\in G} gHg^{-1} \neq G $$ In the solutions to the exercise this is done via explicit counting of elements. I had another idea but am stuck: We can consider the action of $G$ on the set of its subg...

09:42
4
Q: Generating random, but non-uniform state

nervxxxI would like an algorithm that generates a random state, sampled according to some probability distribution which is not uniform in Hilbert space. Assume though that I have at my disposal a uniform (i.e. Haar) random state generator. How do I do that? For concreteness consider the case of a sing...

10:13
3
Q: Why is % difference of aggregation higher than individual % differences?

QueryStack77I'm calculation the % difference in completion rate (before vs after) of Product A (0.3%), Product B (16.7%) and the combination of Product A and B (17.0%). I'm unable to explain why the combination of Product A and B doesn't have a % difference between the one of Product A and B. (Attached the i...

4
Q: Invited a speaker to talk at a conference which is part of a bigger conference and the parent organizers rejected their participation. What to do now?

NadineI am organizing a volunteer academic conference as a part of a larger conference at a top university (let's call it X). Organizers are required to invite speakers to talk about their research in a certain field and then send their agendas to the organizers of the parent conference at X for review...

1
Q: How to maintain balance and center of gravity when pushing a 100-ton piece of asteroid?

TheMatrix Equation-balanceI understand that rotating momentum around a fixed axis can help with the center of balance. But is it enough? In my case, a space tug has to burn its engine for 1 min, accelerate a 100-ton piece of asteroid, and then disconnect from it. There will be no chance for trajectory corrections during o...

CS
CS
11:00
6
Q: Does the meme "breakfast is the most important meal of the day" come from a 1944 cereal marketing campaign?

ChristianEric Brown writes in How Marketing Created the Most Important Meal of the Day: In 1944, a marketing campaign for Grape Nuts would be unleashed called “Eat a Good Breakfast — Do a Better Job”. During radio ads, it would be mentioned, “Nutrition experts say breakfast is the most important meal of ...

1
Q: Which dialect uses "けえ" instead of "から"?

chausiesIn Yakuza 6, a guy called Nagumo speaks with a dialect. Just an example of one line from him is "今度こそ白黒つけちゃるけえの" which, in regular japanese, I'm assuming is "今度こそ白黒つけてやるからな" Anyways, he keeps using "けえ" at the end of sentences (I'm assuming it's a dialect version of "から"). What region is this dia...

11:26
3
Q: What does 凸 mean here?

chausiesIn Yakuza 6, former idol Haruka is looking at an online article about how, as a surrogate daughter of a yakuza, she was spotted in an orphanage in Okinawa. One of the comments on the article says "だれか凸お願いします♪". I'm wondering what 凸 is supposed to mean here? I have a feeling it's some kind of inte...

2
Q: Using multiple filtered 5V rails, derived from a common PSU, together?

komadoriI'm trying to design a peripheral circuit which will attach to a BBC Master (1980s home computer) via one or more of its external ports (specifically the RGB, Analogue, and User ports). Each port carries a 5V supply I could use to power my peripheral. My dilemma is that a schematic of the Master'...

1
Q: Unclear error during Plutus ScriptContext construction (force headList [])

SwiftlyUnmovingI ran into an error while trying to autobalance a transaction body: module Foo.Offchain where import Plutus.V1.Ledger.Scripts (MintingPolicy) import Plutus.V1.Ledger.Address (Address) import Hydra.Cardano.API import Hydra.Prelude import Test.Hydra.Prelude import Cardano.Api.UTxO qualified as UTx...

11:54
2
Q: Genus of a topological surface

SpectrumI am not understanding the geometry of the actual definition of Topological genus of a surface. In Wikipedia I have found the following definition: The genus of a connected, orientable surface is an integer representing the maximum number of cuttings along non-intersecting closed simple curves w...

2
Q: Difference between E(Y) and E(Y|X) in regression

Agustín CugnoIn linear regression, we postulate a model for estimating $E(Y|X)= \beta_0 + \beta_1 x$ We also propose $Y= \beta_0 + \beta_1 x + \mu$ where μ is an error team with expectation equal to zero. We also assume $X$ are fixed, i.e. not random. If we replace the first equation into the second, it will ...

12:17
1
Q: Equivalent of shephard's lemma in consumer theory

John M.I'm studying micro from the Mas-Colell, and I'm trying to understand the proof 2 of proposition 3.G.1. It is about proving that the derivative of the expenditure function w.r.t. the price of a commodity $l$, with $l=1,2,...,L$, yields the hicksian demand function. My reasoning is: $\nabla_p e(p,u...

12:40
6
Q: 1960s Analog Story - Christopher Anvil?

Lee EckhardtThe story - a typical Analog problem-solving story - involves a humanoid alien race that has developed an advanced technology without benefit of electricity. The opening scene: an engineer working inside a rocket accidently throws a lever that begins the launch sequence, which, without electricit...

13:01
3
Q: FIPS 186-4, Use of RSA key pair for Encryption and Signature

cryptSection 5.1 of FIPS 186-4 states that An RSA key pair used for digital signatures shall only be used for one digital signature scheme (e.g., ANS X9.31, RSASSA-PKCS1 v1.5 or RSASSA-PSS) and RSA digital signature key pair shall not be used for other purposes (e.g., key establishment) What probl...

2
Q: Does some kind of "Corrections over Evolutions/New Features" quality label exist, giving guarantees about an open source team's behavior?

Marc Le BihanI've discovered that an open source project I was counting on, was nearly dead by seeing its issues: 80 blockers, 100 criticals, 800+ majors, and a decreasing number of contributions over years. Another project, I had trouble using it. It has 2,600 issues (it doesn't prioritize them) opened. Does...

TeX
TeX
13:46
4
Q: jobname, ifdefstring, IfSubStringInString, detokenize

RyoMy question is originally the same as use jobname to "pass parameters"? But that particular question doesn't seem to have a complete answer. (I'm sure that in the minds of experts who deeply know the issue, it is solved.) Looking at a few other related threads, How can I check if the filename of ...

CS
CS
14:23
1
Q: Is P90NF03L 3.3V logic level MOSFET?

DribbleNibbleSo I want to control my 12V (up to 10A) load through a 3.3V logic level MOSFET. I have purchased the P90NF03L MOSFET but I don't trust my datasheet reading skills so could someone please confirm that this is indeed 3.3V logic level MOSFET?

14:56
1
Q: Why does Windows 10 has a VirtualBox Host-Only Ethernet address I can ping, although I have not specified any Host-only adaptor?

AlexI am using a Ubuntu 20.04 VM in a Windows 10 machine using two network adapters, NAT and Bridged. However, in the "Network Connections of the Windows 10 machine I see "Ethernet4" which is a "VirtualBox Host-Only Ethernet" adapter. I also can ping this address. But why is this adapter available a...

15:29
2
Q: AWD Towing with Sling Type Truck

SadMonkeyI now know AWD towing should be done with a flatbed type truck. But say you have a sling type truck and towed an AWD with the rear wheels on the grounds. This could maybe cause damage to the front end but the front wheels are free to rotate. If the driver went slow and a short distance would thi...

2
Q: Why was the graphical user interface version of Defrag removed?

user10191234I remember in MS-DOS 6.22 that Defrag had a GUI that showed its progress and how it was moving files. It wasn't there in Windows XP and I can only assume that it wasn't in Windows 95, 98, 2000 either (I'm not sure though). Even now in Windows 11, we are still presented with a version that shows a...

DIY
DIY
15:57
2
Q: Is 15mm pipe adequate for a bathroom shower?

Colin FI am currently fitting a new shower valve. The supply to the bathroom is 22mm for both hot and cold branching with 15mm to washbasin, toilet and existing shower valve (H&C). The new valve is dual head, rainfall and conventional both 15mm. The new valve inputs are 3/4". Should I run 22mm as far as...

16:11
2
Q: Change UV wrap size for Image Layer BUT keep UV wrap size for Height Map Layer

NixThis is a question about UV unwrapping. Simple version. I want to unwrap the base color image and the image I use as a "height map" (for shading) on the same surface as two different sizes. What I did: I made this cube (a wall) and I added a texture to use as a height map. The first image sh...

16:32
4
Q: Calculating the Brier or log score from the confusion matrix, or from accuracy, sensitivity, specificity, F1 score etc

Stephan KolassaSuppose I have a confusion matrix, or alternatively any one or more of accuracy, sensitivity, specificity, recall, F1 score or friends for a binary classification problem. How can I calculate the Brier or log score of my classifications from this information?

1
Q: Junk Characters || SSJS Fire Entry || The Japanese characters show Junk when stored in DataExtension

Vishal Kumar C VI am using a simple SSJS code from here. I have updated the Fire Entry API end point as below. /*=== SFMC REST API === */ var payload = { "ContactKey": Account_ID, "EventDefinitionKey":eventkey, "EstablishContactKey": true, ...

1
Q: Delta Hedging using another correlated asset

MattiatoreMy question is about the following (from Maxime de Bellefroid, Ch. 5 The Greeks): From my understanding $\Delta_2$ is the sensitive of the option (on the first instrument with underlying $S_1$) with respect to the price of the second instrument $S_2$, I guess this value can only be estimated an...

CS
CS
16:55
1
Q: How can a conductor with high capacitance store more charge at less potential?

Mohit BhakerIn my textbook a statement is given that goes like "for large C , V is small for a given Q". I am not getting it if charge on a capacitor is increasing wouldn't it increase potential between them. why does it even depend on C?. can someone explain it intuitively.

17:14
4
Q: How could I see the memory difference between a sparse array and constant array?

Kazim Ahmet HasimI have a huge matrix defined using constantarray function and it allocates so much memory preventing the calculation. Therefore, I would like to change the constant array matrix into sparse matrix which stores only nonzero elements enables reducing the memory size. Here is just a simple example. ...

CS
CS
3
Q: My IRL540N is smoking

DribbleNibbleI am using an IRL540N MOSFET to drive a 12 V pump (about 6 A) and a 12 V solenoid valve (about 1 A max). It's smoking after just two uses. I need to know two things. Is it still alright? It's still working and I have switched off power. When do I know it's best to replace it? How do I prevent t...

GIS
GIS
1
Q: Count points in a grid

Aryan IraniI have a grid that I have created and a path that is there. I want to calculate the number of points each grid has or I want to calculate the number of points each slab or rectangle has.

RPG
RPG
17:51
5
Q: Does boosting the caster level of one spell let you grab feats with caster level requirements a few levels earlier?

alexstrasa82Complete Arcane p.72 In the context of a feat or a prestige class requirement, a caster'level prerequisite (such as “caster level 5th”) measures the character’s ability to channel a minimum amount of magical power. For feats or prestige classes requiring a minimum caster level, creatures that us...

RPG
RPG
18:16
4
Q: Can creatures inside the Rope Trick hear the sounds from outside?

smuckenfartThe text of Rope Trick (PHB pg. 273) quotes Those in the extradimensional space can see out of it as if a 3-foot-by- 5- foot window were centered on the rope. and ...creatures that can see the window can’t see through it. Like a one-way-mirror. The description makes no mention of sounds thou...

18:30
2
Q: How to display parameters on PlotLegends?

EconMatricsI used the following code to generate a plot for a function with four different parameters. Plot[ Evaluate@Table[(100*(1 - (x - 1)^(-1/r))/((x - 1)^(1 - 1/r) + 1)), {r, 0.2, 0.8, 0.2}], {x, 2, 6}, AxesLabel -> {"X", "y (Ooptimal choice)"}, PlotTheme -> "Detailed"] The results are as follow...

2
Q: Altering of MPL2.0-based code

iceI have changed MPL-2.0-based code for my needs under the proprietary project and already published these changes as PR in github. But this PR is not in upstream yet (under review, not sure will be merged at all). Could I still use this code or should I wait when PR will be merged and only after t...

1
Q: May I make a removable drive "non ejectable?"

Mr. BoyI have a large SSD drive connected to my iMac as my main working drive, and macOS is still on the internal drive. Can remove the ability to accidentally eject it from Finder somehow? I would just like to make ejecting the drive something a bit harder, so there's no change an errant mouse-click c...

RPG
RPG
8
Q: Which skill feat is necessary to craft Gadgets?

AndrásCraft as a Downtime activity specifies that you need specific skill feats for different types of items: You need the Alchemical Crafting skill feat to create alchemical items, the Magical Crafting skill feat to create magic items, and the Snare Crafting feat to create snares. Gadgets do not fit...

18:55
6
Q: How to plot Clebsch surface with those 27 lines?

yodeI can get its Algebraic Equation by this code: Entity["Surface", "ClebschDiagonalCubic"][EntityProperty["Surface", "AlgebraicEquation"]] Then get its graphics: ContourPlot3D[81 (x^3 + y^3 + z^3) - 9 (x^2 + y^2 + z^2) - 189 (x^2 y + x^2 z + x y^2 + x z^2 + y^2 z + y z^2) + 54 x y z - 9 (x...

1
Q: Are there seven consecutive annual dates which result in Monday-Sunday?

rybo111Choose a date that's a Monday, e.g. 1st Jan 2024. Then keep adding 1 year until you have seven dates in a row that are the days of the week in order (Monday to Sunday). Does such a date combination exist?

19:11
1
Q: Can lines be wrapped in /etc/aliases?

Tim StylesI am using /etc/aliases to direct group emails to multiple accounts, for example: postmaster: john abuse: john www: paul team: john, paul, ringo, george One of the lines is getting quite long due to the number of users it forwards to. Is it possible to wrap the line? I am using Exim as the MTA.

TeX
TeX
5
Q: Opposite of csname

BubayaIf I have a macro \Name that expands to a macro name, I can use that with \csname or the various tools from etoolbox. Can I do the opposite, i.e., get the name of a macro? My use case is the following: I want to write a command \Mtx that produces a smallmatrix (from mathtools). An optional argume...

19:35
3
Q: Adding classes from a given array or an object

B.D LiroyI want to add classes to elements based on a source array or object. For example, it can be: classesArr = ["class1", "class2", "class3"]; or classesObj = {class1: "class1", class2: "class2", class3: "class3"}; the way I currently do it is: // for arrays element = document.getElementById("myelement

19:46
3
Q: Grouping symmetric points in 2D domain

A. PII have the following list of points L = { {-0.980187,-1.07694}, {-0.980187,1.07694}, {-0.788396,-1.81236},{-0.788396,1.81236}, {-0.437793,-1.07694},{-0.437793,1.07694}, {-0.157935,-1.81236},{-0.157935,1.81236}, {0.157935,-1.81236},{0.157935,1.81236}, {0.437793,-1.07694},{0...

ELL
ELL
1
Q: Question about "to comprise"

rajesunI understand that "comprise" can be used when it refers to the totality of something: Our class comprises a total of 100 students. However, I would like to know if "comprise" can also be used when it refers to a portion of something: Our class of 100 students comprises 5 French students and...

20:14
3
Q: What does a 20km/s wind coming through a portal look like?

StephenIf your anchored-to-a-gateway-at-one-end-but-other-end-free-floating wormhole technology has the handwaved ability to match orientation and velocity to the surface of a distant planet, it also has the ability to not match the orientation and velocity of the surface of a distant planet, and if you...

20:26
3
Q: Are these uses of em dashes extant in English-language fiction?

COTOI'm giving some authoring advice to a newer writer. She has a curious convention where she uses an em dash at the end of a sentence in the narrative when she wants to indicate an abrupt change of subject (call this "case 1"). Her writing is private, hence the following is an example I've contrive...

20:59
14
Q: Output a random value from the last 16 values outputted

mousetailOutput the numbers 1-16 (or any other set of 16 distinct items). Then, repeatedly, output a random value chosen uniformly from the last 16 items outputted. After the same item is printed 16 times in a row, halt. If a number appears multiple times in the last 16 values, it should have proportional...

CS
CS
1
Q: Is entropy in the third law of thermodynamics a continuous quantity?

KlausKIn the third law of thermodynamics, entropy goes to zero or to a constant value at vanishing absolute temperature. The change of entropy also goes to zero. The third law is valid in the thermodynamic limit, which means, it is valid in the case that the system is infinitely large. In contrast, in ...

1
Q: Cross-validation methods for regression and classification models

TWestApologies for the basic question, but I've been reading about cross-validation methods/metrics and I would like to confirm if my understanding is correct: Some can only be used for regression models (e.g., Root Mean Squared Error, Mean Absolute Error, R2 Error, etc.); Some can only be used for c...

21:40
2
Q: Extracting entropy from bytes

adcmost smart contracts that rely on "randomness", will require said entropy to be in a number format. A practical way to extract entropy from a arbitrary payload is by using a hashing function. This means that it's intuitive have the entropy in bytes format inside a Tezos smart contract. There are no

DIY
DIY
21:52
1
Q: Why do my lights flicker but only in certain rooms?

Brian SalmeI have a three bedroom house with a long hallway. If you were to walk down the hallway, the first room is on the left. Next is the bathroom on the right, and finally the last two bedrooms across from each other. On the right hand side is the master bedroom with en-suite bathroom. Every once i...

5
Q: Add a line and turn this into a sport

RogerAAdd a straight line to this visual and turn it into a sport.

ELL
ELL
2
Q: I was knit a sweater

Pumpkin 777Can to knit be used in this passive structure? The meaning I want this sentence to have is Someone knit a sweater to for me. I was knit a sweater. I know that to give can be used in this passive structure, for example: ▪︎ I was given a toy.

GIS
GIS
1
Q: Defining and altering the extent of a map in print layout of QGIS

JasonHow can I change the extent of a map in print layout to be a custom-sized region. I would like to be able to drag the handles of of the bounding box to resize them so that they touch the purple box. Currently dragging the handles makes the map rescale to be smaller but the doesn't "crop" the box....

22:21
2
Q: Could a planet have 1/2 the Earth’s mass but 1 g surface gravity?

user98816So, we have a captured planet/moon orbiting a gas giant in the habitable zone. It is akin to prehistoric Mars, its geological activity having been maintained by constant tidal flexing from the gas giant. It is half the mass of earth, but knowing that the volume of a planet affects its surface gra...

ELL
ELL
1
Q: "a lowly profitable company": is it correct?

calebCan one comfortably say in English "a lowly profitable company"? My research indicates that there are almost no instances of this usage. My guess is that, maybe, it is awkward to combine "lowly" with "profitable", because the concepts are antagonistic. Native speakers: Does the expression seem pe...

2
Q: Complex binomial series

Devang Tripathi$$\sum_{r=0}^n \left[\frac{r+1}{r+2} (^n C_r) (x^r)\right] $$ Can someone help me evaluate this summation? I could solve till a certain extent but was then stuck. Would really help! so i started by differentiating $x(x+1)^n$ and got the coefficient of $(r+1)$. then I integrated the function I got...

22:49
1
Q: Why are map icons missing?

NolonarI've noticed that sometimes the map isn't displaying any icons, and it makes using the map much harder: In the above screenshot, we can see a map of the bridge, and we should at least see icons for the save station, elevators, bench, and shop, but they are not displayed. Why is that, and how can...

7
Q: Do I need a virtual destructor for a second interface class?

EdzijuI've got classes called "Base" and "Derived". struct Base { Base() = default; virtual ~Base() = default; Base(const Base&) = delete; Base& operator=(const Base&) = delete; virtual void DoStuff() = 0; }; The "Base" class needs virtual destructor and it's understandable. Also ...

23:08
3
Q: Elementary operations on list of points

A. PII have a list of points $$L = \{\{x_1,y_1\}, \{x_2,y_2\}, \{x_3,y_3\},\cdots\{x_n,y_n\}\}$$ and I want to create a list $$L1 = \{f(x_1,y_1), f(x_2,y_2), \cdots, f(x_n,y_n)\},$$ where $f$ is some function. Let us take the example $f(x,y) = x^i y^j.$ Is there a simple direct method? In my example, ...

UX
UX
1
Q: UI Design: I can't understand the concept of design tokens

BluebugI have created a few design systems in Figma for different companies. Some are simple, and some are complex. But till now I can't understand the concept of design tokens. Every article or video I watch just says jargons like 'It helps to store design decisions for our brand...'. Figma does have s...

4
Q: Is Queen's Killer Queen in 4/4, 12/8, or both?

welshbloomI'm writing about Queen songs and have encountered some interesting differences of opinion in respect of the time signature of Killer Queen. I have always heard the song in 4/4, as defined by the five clicks at the start of the song and - to my ears - the strong sense of the beat being four crotc...

RPG
RPG
4
Q: Can a player use two characters in a campaign?

ArgoI've been the DM in a campaign based in the Eberron world and the party is made primarily out of squishy level 4 characters (wizard, druid, and a bard.) During one of the combat encounters we had an issue where one of the enemies had resistance to magic which ended up making it so I had to rethin...

3
Q: Is it possible to get camera information in Geometry Nodes?

Rury NelsonI am trying to build a tool in out of geometry, the idea being, it targets a camera, then affects the contained geometry based on camera info. Position, rotation, etc. isn't proving to hard to get, but I would like to get information like Field of View. Is that possible?

23:23
6
Q: Can someone please explain to me the origin of the idiom "I did her"

curiousUserI've been watching a TV show called Two and a Half Men and there's a part where Allan says to Charlie Why what'd you do? and Charlie replies I did Rose. I've researched this and found that the word "did" here means "have sex" so basically what he meant is: I had sex with Rose But my doubt i...

2
Q: Raw data vs information encoded in OP_RETURNs

Son Kaos999Imagine I want to fill the 80 bytes of OP_RETURN data with zeroes, so that the resulting data is 640 bits set to 0, or 160 hex digits set to 0. The data is 640 bits but the information encoded is much smaller, and can be represented with less data. Is the P2P network optimized to relay the OP_RET...

2
Q: Have there been any overweight Oscar nominees in the 21st Century?

gsamarasThe Oscars have stated that they want to increase diversity, so when I heard that the protagonist of The Whale movie was an Oscar nominee, I thought that this was great! However, I saw on TV that the actor is a normal-weighing person, apparently disguising himself for the needs of the movie as an...

1
Q: Redactor creating <p> tags outside it's parent

mencantalamelvaI am using redactor for creating a rich text field. The thing is that I'm using the exact same field on two separate sections. On one it is working fine, but on the other one, it is creating <p> tags outside the parent's div. On the upper screenshots redactor is working how I want it to work. O...

23:50
1
Q: Photoshop - what's the difference between "Rasterize Layer" and "Convert to Layers"

DraganI've recently come across a new menu command for smart objects - "Convert to Layers", I don't really understand its purpose as all it seems to do is reverting a smart object back to a raster layer. What is it meant to be used for where there already is the "Rasterize Layer"command?


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