The Nineteenth Byte

OldSandboxPosts

01:00

Sandbox posts last active a week ago: Find the Geometric Mean of a set of Numbers, Adjacent Items Sorting code-golf open-ended-function

Bbrk24

04:33

Why on earth is Git for Windows’ default text editor Notepad++

Like vim makes sense because it can exist in the same terminal window

Bubbler

because it is the default text editor on your Windows?

definitely not Git's fault

lyxal

^

> If not configured, Git uses your system’s default editor

git-scm.com/book/en/v2/…

mousetail

05:45

@Bbrk24 git config --global core.editor nano

Sandbox Posts

06:27

0

A: Sandbox for Proposed Challenges

Minkowski's ?(x) (with rational x) Here is Minkowski's question mark function: It is a strictly increasing and continuous function from the reals to themselves that, among other unusual properties, maps rational numbers to dyadic rationals (those with a power-of-two denominator). Specifically, s...

Parcly Taxel

There are now 4321 answers on the Sandbox

Unrelated String

nice

lyxal

07:16

@ParclyTaxel 9735 actually

It's just that you can't see the 5400 deleted answers :p

Bbrk24

11:36

@Bubbler No, the default is Notepad.exe. Installing Git for Windows will go out of its way to install Notepad++ if you don’t stop it

@mousetail No, I know how to change it. It’s just weird to me that it defaults to vim on other OS’s but then Notepad++ on Windows

mousetail

It doesn't default to vim on other platforms, it uses the global config

On unbuntu that is nano

Bbrk24

on macOS it’s vim at least

Here's an excerpt from a thing I wrote: GIT_EDITOR='sed -i 1!s/^pick/squash/'

Dannyu NDos

11:58

In NixOS it's nano.

mousetail

I know how to exit vim but still can't figure out how to actually type in it.

I used it in git for a long time (only for merge commits) when I always just accepted the default message. I don't know how to actually change the message though

Bbrk24

You have to press i or a to enter “insert mode” where you can actually type

then you press escape to exit insert mode, and get back to the point where you can either :wq or :q!

emanresu A

The real challenge is exiting vim

Ginger

obligatory

Sep 29, 2022 at 18:05, by Seggan

mousetail

I do i but then I type like to characters then get into some other random mode and can't type anymore

Ginger

12:04

real coders use their task manager to kill the vim process

mousetail

I can quit no problem

Ginger

real coders press Alt+SysRq+K to kill all processes in the current virtual terminal

Bbrk24

12:16

What does the SysRq key actually do?

Ginger

lots of things, at least on Linux

it's like Ctrl-Alt-Delete except more dangerous :p

mousetail

My work is going to force me to switch to windows :cry:

Ginger

o7

lyxal

@Bbrk24 you sure? the release notes suggest vim is the default it comes with

Ginger

> Send the SIGKILL signal to all processes except init

jesus linux

guys whatever you do don't press Alt+SysRq+I (using a QWERTY keyboard), worst mistake of my life

heh, I wonder how systemd'd react to every single service just dying at the same time

mousetail

12:22

Systemd would just restart most of them automatically right?

Ginger

maybe?

depends on what they're configured to do

you'd probably end up with a dysfunctional system at best and a broken one at worst

mousetail

It might just be a faster system restart

Since you are rebooting most everything but not the kernel or systemd which take the mos time to start up

Depends on if it starts them in the correct order though, it might not

Ginger

I wouldn't advise it, especially since killing every running process is liable to leave a lot of things unclosed

it would probably also kill DBus, which would be an even bigger kerfuffle

mousetail

It there a way to send a more gentle kill signal to every procss at once?

That gives them some time to close resources

Ginger

yeah, Alt+SysRq+E SIGTERMs everything (except init)

but if you really want the nuclear option Alt+SysRq+B will force-reboot the system

mousetail

12:26

That might be a more sane way to do a quick restart. You'd still get the ordering issue though

Ginger

systemd is pretty good at starting tasks in the correct order

mousetail

Yea after boot, but I don't know if it respects the requirements when rebooting services

Ginger

IIRC it does

~~but as we all know there's only one real way to find out~~

mousetail

Ok then I'm doing that when I need to reboot. I don't have a SysRq button on my keyboard though

Ginger

it's sometimes aliased to PrtScn

> From user space programs (such as a command line shell), SysRq may be accessed by writing to /proc/sysrq-trigger (e.g., echo s > /proc/sysrq-trigger).

or you could do that, I guess

mousetail

12:31

I'm not root so I guess it wouldn't even work with the button

Ginger

I'm not sure you have to be root? I'll test this later

mousetail

I assume so, this seems like a major security issue if anyone could do it

You can't just kill processes from other users

Ginger

yeah I guess

huh, it works on Chromebooks too

but you have to use Volume Up instead of SysRq

lyxal

@Ginger ~~okay rydwolf~~

Ginger

blech, don't you accuse me of using a Chromebook

lyxal

12:36

I do as I please and please as I do

Ginger

( ͡° ͜ʖ ͡°)

Bbrk24

I don’t have a SysRq key but I do have an email key and a calculator key

I’m also on Windows so

Ginger

ooh do you have one of those big Dell keyboards

mousetail

Fun times: When I use the calculator button in linux it opens infinite calculators. I press it just once and it just infinitly keeps opening more till I had to force shutdown my computer

lyxal

sounds like my kind of key

Ginger

12:45

C A L C U L A T O R

Bbrk24

13:01

@Ginger Logitech, actually

Ginger

ah

Bbrk24

13:13

I also have both play/pause and pause/break

mousetail

LDQ For error tracebacks: Filename and code on the same line or on separate lines?

LDQ Show traceback lines inside libraries by default?

Bbrk24

@mousetail What I’ve most commonly seen is some variation on “funcName at file:line” (or file:line:column)

Unrelated String

^

Bbrk24

@mousetail Only if debug symbols are available. Too many times has Swift given me “error at <some random assembly address>” for me to encourage that

mousetail

    Either:

    /file/path/abc.cd: print(x)

    Or:

    At /file/path.abc.cd:
        print(or)

Unrelated String

13:18

also maybe have some kind of visible cutoff between the user code and library stack traces

Bbrk24

^

mousetail

There is not nececairly a single cutoff point though, it can switch back and forth as library code uses user code again via callback etc

Bbrk24

mm true

Unrelated String

because it can be useful to see the library stack trace but it's also a pain in the ass to find where you're fucking something up (outside the cases where there's something wrong in the library that you can and will fix there)

hmm

i'd say display the cutoff under the last piece of user code in the stack trace

mousetail

I'll definatly have a command line option to show the full stack trace including library code, just wondering what the default should be

The amount of library code above the user code in the stack trace is often significantly more than what comes after it, and is even more rarely relevant for the actual error.

Most any web framework will add like 10-15 stack frames before any user code even begins, that is the main part I want to get rid of since it's extremly unlikely that that code will cause crashes

Unrelated String

13:26

mmmm

Bbrk24

I’ve seen things where I have 20 stack frames of random framework assembly (not even function names, just addresses) before anything I can do anything about

Unrelated String

maybe have a fixed small window of library code by default? though i guess yeah it depends on the library whether or not that's adequate for finding something that is relevant :P

so maybe just not showing it at all by default would work

mousetail

What if I just show the top and bottom stack in a sequence of library code?

Unrelated String

or maybe like three lines and then a line with a bunch of ellipses telling you about the flag you can use to get all of it

that would be smart

mousetail

Also LDQ Absolute paths in stack traces, or relative to the current working directory?

Or just filenames?

Unrelated String

13:30

if there's a concept of project root or whatever, do relative within that and absolute outside

or elide the absolute path leading up to the project root if it's inside

Bbrk24

13:48

Swift is in the process of changing from absolute paths to “ModuleName/FileName”

New Posts

17:03

0

Q: Calculate the Smith normal form of an integer matrix

Given an \$m \times n\$ matrix of integers A, there exist a \$m \times m\$ matrix P, an \$m \times n\$ matrix D, and an \$n \times n\$ matrix Q such that: \$A = P D Q\$. P and Q are unimodular matrices (i.e. matrices which are invertible and whose inverses are also integer matrices); D is diagon...

DLosc

17:21

@mousetail The code should definitely go on its own line. It should be identical to the line of code as it appears in the file.

mousetail

Ok to strip leading whitespace though?

DLosc

I'd say no

But that's probably 50% my pickiness and 50% Pythonism, so make of that what you will

If your language has any kind of syntactially meaningful whitespace, though, definitely don't strip it

mousetail

Even in python whitespace is only relavent relative to other lines, it has no meaning when showing just a single line

DLosc

@mousetail Sort of, although it gives you some context about how deeply nested the statement is. Mainly, I'd want it so when I'm skimming through the code file, I can recognize the line more easily.

Should I just Ctrl-G to go to the exact line mentioned? Maybe. On the other hand, I have had instances where the line numbers didn't match up because the code that was erroring was an older version than the current version I was editing, so...

New Posts

18:03

0

Q: Minkowski's ?(x) for rational x

Here is Minkowski's question mark function: It is a strictly increasing and continuous function from the reals to themselves that, among other unusual properties, maps rational numbers to dyadic rationals (those with a power-of-two denominator). Specifically, suppose the continued fraction repre...

code-golf math binary rational-numbers

PlaceReporter99

18:18

Why is $ e^x $ faster to calculate than $ 2^x $?

mousetail

Probably because there is a instruction for it

2^x is obviously way faster for integers

Why do you think it's faster?

PlaceReporter99

I used timeit module in python for x=100 and found that e^x was between 2 and 3 times faster.

The Thonnu

In [3]: timeit.timeit("e**10", setup="from math import e")
Out[3]: 0.043408332999995025

In [4]: timeit.timeit("2**10")
Out[4]: 0.009667582999995261

That's not what I'm getting

Wait, for x=100 it is actually quicker

In [5]: timeit.timeit("e**100", setup="from math import e")
Out[5]: 0.047165832999993995

In [6]: timeit.timeit("2**100")
Out[6]: 0.24668895800000712

mousetail

I assume math.exp would be way faster than e**x

/math.exp2

The Thonnu

In [7]: timeit.timeit("exp(100)", setup="from math import exp")
Out[7]: 0.05063174999997955

Nope

About the same

mousetail

18:33

Strange

The Thonnu

(I'm on 3.9.9 btw, don't know if it makes a difference)

mousetail

You'd need to use C to get a accurate measurement

PlaceReporter99

I was using IDLE

mousetail

With exp or ** notation?

PlaceReporter99

Instead of importing math, I did e=2.718281828459045

mousetail

18:34

I guess ** might be more efficient for integers

That would make sense

PlaceReporter99

Using ** notation

maybe it’s because of Taylor series?

mousetail

No, because 2 is a integer

PlaceReporter99

I was a uggesting why e^x is faster

* suggesting not a uggesting

mousetail

I'm guessing for integers they use a simple loop

so it's much faster for small values but slower for large values of X

that would explan Thonnu's results

Seggan

18:51

progress

(it took me 2 days to do this lol)

PlaceReporter99

@Seggan Doing this using Tkinter in python would be much faster.

Seggan

python shudders

the whole point of this was to make it lightweight anyway

those 2 days were spent trying to figure out how to make an input box in tui

and also im racing ginger who is already doing it in python

mousetail

It looks really nice, impressive

TKinter looks butugly

Bbrk24

I have just seen what I presume is a switch expression in C# for the first time and what

why is it foo switch instead of switch (foo)

mousetail

I'm pretty sure C# uses normal switch syntax

DLosc

19:06

^

Bbrk24

it does for switch statements

this is a switch expression

DLosc

... Huh

mousetail

I have a secret version in pure TS

DLosc

@Bbrk24 Maybe for the same reason that Python uses a if cond else b

Seggan

@mousetail the race is on!

mousetail

19:15

Maybe we should define what features we need to be considered done? I want a quick channel switcher and the starboard visible but then I'm doneish I think. Or is there anything else you are planning to add you feel is nececairy for the chat experience

Seggan

im planning for discord style :emoji:, channel tabs, and there was smth else...

~~reactions~~

mousetail

Reactions would be nice

I'm thinking some kind of syntax like ^^^:smile: to react a smile to the message 3 above. So it looks kinda ok to people who don't have a special app

Ginger

ooh good idea

I'm gonna add that (once Rydwolf's servers are back up, that is :b)

@PlaceReporter99 blech, tk

the PDF of GUI libraries

also, for Pride Month (yes I know I'm early) I made a little webpage tool for adding transparent flag overlays to an image! I'm going to put it on Rydwolf's server once it's back up but for now yall can download the source here

(it also works for the Ukrainian flag)

Aiden Chow

20:28

bruh why an invalid and not even golfed answer get 4 upvotes....

codegolf.stackexchange.com/a/260756/96039 like bruh first of all it take variable input, i thought yall say thats invalid??? and also the tio link is in the header like bruh. and also theres no golfing at all, all the latex syntax isnt removed

only thing that was removed was \operatorname but thats about it

and also theres suppose to be newlines between every expression.... where is that here???

DLosc

@AidenChow It seems like there are some problems with the answer that need to be pointed out, but we do want to be gentler with new users who probably don't know about rules like not taking input from variables.

And our standard for golfing is "makes some effort," not "golfed as well as an expert in Desmos golf could golf it." ;)

Aiden Chow

@DLosc bruh theres like no golfing effort lol, if i copy pasted each expression straight from desmos that would pretty much be what i would see, all the \left's and \right's are all there. as i mentioned before the only thing that seems to be removed is \operatorname but pretty much half of these other golfs can be seen in the tips for desmos golfing page

like at least 20 bytes can be removed from trivial removals like that

not even considering more "nitty gritty" golfs like restructuring the code or anything like that

DLosc

20:44

@AidenChow So they haven't read the tips for golfing page. ¯\_(ツ)_/¯ What's trivial to you might be black magic to someone else. If so, view it as an opportunity to introduce someone to something really cool.

Here's an example of a good comment to a new user whose post had formatting and content issues.

Aiden Chow

@DLosc its common desmos knowledge to be able to remove the latex syntax that is copied out.... the \right's and left's for instance are only there to make the expression look better

@DLosc the link dont go anywhere??

its not showing any comment

DLosc

@AidenChow Huh, works for me. Try this link (to the answer) instead?

Aiden Chow

@DLosc oh ye that works

bruuuh holy fuck i just scroll down and see this post, dude cmon is this guy even trying to golf: codegolf.stackexchange.com/a/260744/96039

DLosc

@AidenChow Anything that's "common knowledge" is something everybody had to learn for the first time at some point. Why not post a comment saying, "You can save bytes by removing the \right's and left's--they're only there to make the expression look better"?

Ginger

^

you had to learn all this stuff yourself, no?

AviFS

20:59

@Simd Why are they not useful?

Seggan

@AidenChow case in DLosc's point: you had to point that out to me too

Aiden Chow

damn dupe answer from mine, first time that happen to me lol: codegolf.stackexchange.com/questions/36260/make-an-error-quine/…

(my answer for reference: codegolf.stackexchange.com/a/253419/96039)

Seggan

21:16

ooh 2023 SO survey is on

Ginger

don't take it, you don't get a badge

and the reason for that is SE playing fast and loose with the data from the earlier ones and trying to cover their ass this year

DLosc

?

Ginger

didn't ya see the meta post?

-140

Q: (UPDATED 2023 May 8) - Changes to the Census badge

As we prepare to launch the 2023 Developer Survey in the coming days, we wanted to provide an update to the community regarding the Census badge. In case you're not familiar with the Census badge, this badge is awarded to users who complete the Developer Survey. Beginning this year, we will no lo...

discussion featured badges announcement census

Seggan

@Ginger its fun to complete it, idc abt the badge

Ginger

alright, go ahead I guess

DLosc

21:24

^^

Although I didn't realize the full data set of results was made public

It's probably not a big deal for me--I didn't put much on the survey that you couldn't learn from my GitHub page :P

Seggan

theres a whole AI section this year

Ginger

indeed

they also dropped the "about you" section, probably because of ^^^^^^^^

Seggan

nope, they havent

Ginger

???

the questions about "what's your gender" and such were gone when I took it

Seggan

ah such ones

i still get age, location, years coding, schooling

Ginger

21:31

ah

DLosc

@Neil Pip -p, 12 bytes: R:@YUW\,aFLy

Or 10 bytes by porting Unrelated String's Jelly answer: vE_*_SK\,a

Adám

@DLosc Hm, I also didn't realise this. Surely, I'm easily identifiable. I'd be the only Danish full-time APL-only programmer in my age bracket that has been programming since I was a child. I guess my salary was made public last year. For me, that's not a big deal, but I can definitely see why some people might not like this. Btw, in Sweden, everyone's salary is public info.

New Posts

22:14

0

Q: Given 4 fence lengths, what's the largest rectangular yard you can make?

Here's a very simple little problem that I don't believe has been asked before. Challenge Write a program or a function that takes in four positive integers that represents the lengths of movable but unbreakable and unbendable straight fences. Output the area of the largest rectangular yard that ...

code-golf arithmetic geometry

Seggan

23:39

@Adám which begs the question: how many SE users are as easily identifiable as you are?

surely not many

Seggan

why is working with callbacks so hard in rust

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