The Nineteenth Byte

On my school computer, I have every Cyrillic keyboard layout ever, and mongolian, and every arabic, and two latin keyboards (English and Canadian French)

ATaco

(Forth one is for Jelly, third is for RProgN2)

Zacharý

2:03 AM

@ATaco ... you program Forth? Didn't know that.

Well, you can get rid of one thanks to Adám

Anonymous

@Downgoat Nope

Zacharý

Quick poll, for the Linux Users here, which distro do you use?

ATaco

Fedora.

Pavel

@Zacharý Fedora 27 w/ Cinnamon

Zacharý

Ubuntu. I'm thinking of getting Arch as well, possibly Kali just to say I use Kali ;)

Downgoat

2:06 AM

@Zacharý Debian

user202729

I don't know how to install Linux... without a USB or DVD. The Internet doesn't help much.

Pavel

@user202729 You kinda don't?

Zacharý

@Pavel What do you mean?

Pavel

@Zacharý It's technically possible to install Linux without a USB or DVD. It's really hard and might make your system unusable.

Zacharý

@Pavel How do you do that?

(I won't attempt that, ever)

Pavel

2:10 AM

@Zacharý If you need step-by-step instructions, I'm not the one to look for, but basically the idea is you have Linux on another computer and install over the network.

Zacharý

... nope, sounds like a horrible idea ...

user202729

That's even a bigger requirement...

I've read

45

Q: Install Ubuntu without CD and USB , how?

I want to install Ubuntu on my laptop , that doesn't have a CD-ROM drive , and I have no spare USB disk spare. I've tried Wubi , but that doesn't seem to work (since it prompts me to have the CD in the drive, wich I dont have.) How can I install Ubuntu , easily and in a fast way? P.s: I want it...

wubi

but I am using NTFS on the Windows partition and NieDzejkob said that it doesn't work.

Pavel

@user202729 Wubi is ancient and will probably corrupt your hard drive if you try it.

Even if all the conditions are good

user202729

I remembered installing Windows 10 from Windows XP without using USB or CD. That time the Internet was useful.

Zacharý

I've had an idea (never going to implement this) to create a Linux distro (though you might not call this idea that though) that runs completely off of a flash drive and cache.

Pavel

2:13 AM

@user202729 Well yeah, Microsoft has an executable for that. Like Wubi but functional.

Zacharý

(Solely to circumvent school computers)

user202729

When school computers are protected too well, students complains (^) and when they are not protected well enough, students complains about viruses (assuming Windows) and cannot-start-computer issues.

Pavel

@Zacharý That exists and is called ExtraPC, for people with corrupted hard drives and stuff.

Zacharý

OR some stupid idiot makes a batch virus and gets CMD blocked (one of my friends), or deletes an ENTIRE NETWORK DRIVE (one of my close friends), or spams a drive until we get in trouble (Me and that close friend)

Pavel

@Zacharý Or takes down the authentication service across the entire district, preventing anyone from logging in (me).

(I installed a pirated copy of Minecraft onto a school computer, and, welp.)

Zacharý

2:19 AM

... that makes me and my two friends seem like weaklings. The closest thing we had to a horrible conspiracy was to mass install Linux (again, never going to implement)

Could you imagine what would happen if the teens from PPCG went to one school district? That would be ... fun ... to say the least.

Pavel

@Zacharý It was completely an accident.

Zacharý

Any more fun things like that happen? In a bigger school district, there's bound to be more than ~4 computer-savvy people.

Pavel

Well another time someone got all the printers in the school to show "I KILL TREES"

Zacharý

... holy crap ... I've got some plans for my senior year now!

The worst I've done is put a shutdown bash script in startup (dumb idea, really stupid)

ATaco

<style>*{display:block}style:before{content:'<style> is a valid HTML quine. Do with this knowledge what you will.

Pavel

2:25 AM

Another time a friend of mine got a teacher's computer to just say the word HACKED with a pure white bacground for a day

Christopher 2EZ 4RTZ

I almost got in massive crap for hacking the school wifi password b/c i know how to do it XD

that is basically it

Pavel

This was accomplished by plugging the projector into an intel compute stick, so no hacking wizardry was actually done

Christopher 2EZ 4RTZ

:|

Pavel

But when IT came, he switched plugs again, and then IT left, and he made it be HACKED again.

ATaco

I guessed our schools Wi-fi password back in the day.

Christopher 2EZ 4RTZ

2:26 AM

rolf

@ATaco ditto

Pavel

It wasn't l337t hax or anything but it was really funny.

Christopher 2EZ 4RTZ

then they changed it

Zacharý

OH, I remember one time some guy got the admin password ... they had to change it after that.

Christopher 2EZ 4RTZ

Our school blacklisted everyone who got on the school teacher only wifi

XD

ThisIsWiFI

greatest password

Zacharý

Maybe we should conspire to do something insane.

password is my password for all my Linuxes, my uncle set that up for my first linux (now broken), and it stuck with me.

Christopher 2EZ 4RTZ

2:28 AM

@Zacharý i wrote a batch file that just made millions of files in the documents computer

Zacharý

I've done that with an excel file ^

Christopher 2EZ 4RTZ

lol

if you print the college common application from the web you block the printer

Zacharý

Oh, my friend made this "riddle quiz" that when it ended, it upped your volume all the way and played a, now removed, youtube video that said "Game Over", and it did this like 30 times at once... ahhh, good times, good times.

Christopher 2EZ 4RTZ

XD

i have this odd habit of breaking anything

Zacharý

I might be able to post it here. And same here ^

Christopher 2EZ 4RTZ

2:31 AM

in Econ my teacher got mad because we botted every kahoot game we played

I got about 5 of us together

so whenever she blamed one they closed their bot net and every else joined

repeat

Zacharý

Our school did that as well, I didn't participate in it.

Christopher 2EZ 4RTZ

@Zacharý you mean nothing now

Zacharý

What do you mean?

I've made a JS file that does it, I just never used it.

Christopher 2EZ 4RTZ

o

Pavel

Kahoot lets your name be a single ZWNJ and after people realized this fact no one had a username again.

Zacharý

2:33 AM

We should definitely try to conspire a cross-district thing, that would be fun.

ZWNJ?

Christopher 2EZ 4RTZ

zero width non

Zacharý

My username was always ý, because Czech (orthography) is love, Czech is life

Pavel

Zero-width non-joiner

It's that character that SE occasionally sticks in the middle of comments for no reason.

Zacharý

I might bring my personal computer (if I ever get Kali installed) and do some stuff ... because why not. It'll probably be my senior year

Christopher 2EZ 4RTZ

hah

it is mine you youngin

Zacharý

2:37 AM

Eh, I'm already a year ahead of my school in both math + science classes, so I fit in with those seniors quite nicely.

And our school's comp sci teacher is so damn oblivious!

So ... anything big happen while I was pun-spended?

user202729

@HyperNeutrino Which one was problematic? A000109?

HyperNeutrino

Yes.

Progress

https://tio.run/##tVbbbtswDH12voLrk7V6RS7tS7cMSD6gwJ49o1ATtZPtyI6tYO1@vqNIy5fETYcBLVDEIike8vBIdvlifxVm8fr6WBU70FZVtijyGvSuLCoLpap2ByutLkw9mWzVI8htKjfKbF7CzcsmV7W4nQT8BEvgh/g2mQS1/qNay1VZlKGYBDtpK/2M5jieJvAZKOixqOAetIFKmicVOpvABM5Mu52L0yBUoCNII8h8ameBL0uYfYW0@c3oFx2MFuskThOMb5ZpgpZuid6st8yG3vTES6kwe6XsoTLYyABFP4KGT0usReW1gik1l3bN5cqE7QYhEvLrMT86mfBK5fJB5do81f9DeXGw5cE6yhtOZUVQO2Wsw93JMsx1baPBrMPeLITDC6RLYQ9lrsK4lyJW3EM3pUTAyOgQnND3zjRAkpS@qfNKlqUyW6oo3Au4hNjVkIiWcI5jag4GM4QyggeXw09EdQVJNxAFpqBWHxLMR5kfBCfQBgVfq439tzyUg3daZKBG/47rb/ZQ8o7RP7oMP0skkPc8VbL8VYem2PIMMSc9w7clzG/B4yY9z3IJi…

user202729

@HyperNeutrino Why Python and not Proton?

Zacharý

It would be a (pro)**ton** of work.

HyperNeutrino

@user202729 because itertools is broken in proton and it's much faster in python. I'll probably modify my answer to use Pyon (which is a superset of Python so I can just copy the code :p)

Pavel

2:52 AM

Pyon? Link?

user202729

So fix it (instead), it's your programming language.

HyperNeutrino

github.com/alexander-liao/pyon

@user202729 I'm going to do that eventually (if I ever find enough time to redo enough of it to make a substantial fix), but for now I think it's important I get an actual correct solution up there before caird decides to invalidate it and finish the challenge :P

user202729

Information: OEIS is down right now.

Zacharý

That seems to happen more often than it should.

HyperNeutrino

that's inconvenient :(

I'm not currently working on my solution to that one because I have some homework and then I need to sleep in a bit

Zacharý

3:00 AM

Are any of the students here taking that ACT Saturday?

user202729

@HyperNeutrino I'll take a look at the code anyway. /// Do your homework, leave TNB, it (almost surely) slows down your speed.

HyperNeutrino

good point especially since notifications are a thing :p anyway cya later o/

oh wait before i leave, tomorrow there will probably end up being two advent challenges because unfortunately i had a crammed schedule today and didn't have time to post one. if anyone would like to post advent 7, please feel free to do so because i don't want the chain to break too much :p anyway bye o/

3

user202729

^ Star so that other people can see it. (pin notification)

Zacharý

Cya, ಠ_ಠ

user202729

Anyone know how to print stack trace in C++ (g++) on _GLIBCXX_DEBUG error?

ATaco

3:12 AM

C++ has stack trace?

user202729

Well, why not?

Pavel

@user202729 Optimizing compilers would inline most nonrecursive calls.

user202729

tio.run/…

Not particularly useful, but at least I know on which line is the error.

Leaky Nun

@user202729 long time no see

hi everyone else

ATaco

Hi leaky

Leaky Nun

3:18 AM

github.com/kckennylau/ordinals/blob/master/ordinals.py

wrote a little program that can do ordinals

at least, those that are up to epsilon_0

Pavel

5:15 AM

@user202729 How does it compile with no return when it should return int?

CMP: Do you generally close shells with exit, alt-f4, or ctrl-d?

Leaky Nun

exit

Pavel

ctrl-d

ATaco

Alt-f4

(Or the X button)

Pavel

ew

ATaco

CMP: How do you open your shells?

Pavel

5:36 AM

Ctrl-Alt-T

~~alt+f2 tilix~~

user202729

6:04 AM

@Pavel Well, why not? By convention the return value is put in eax (or equivalent), so writing return 123; is (something equivalent to) mov eax, 123; ret; in assembly. Without setting eax it is always some value, which is why the tip "return by assignment" works.

Pavel

Intresting.

ATaco

Huh, TIL.

Is eax (Or equivalent) reset after the return? or could you theoretically have a call at the end and just implicitely pass it's return value?

Well I'll be damned.

Pavel

@ATaco Nah, why reset it?

New Main Posts

6:34 AM

-1

Q: Sorting in ARM Sim assembly

Write an assembly program that sorts positive integers. The source file is to be named sort.s The input file is to be named input.txt and will consist of non-negative integers, one integer per line. The output is the same set of integers printed to STDOUT, one per line, but sorted in ascending or...

sorting assembly

NieDzejkob

@Downgoat Not true, Mac can run factorio and that's the only thing I care about so in my mind Mac can do games

Pavel

@NieDzejkob Factorio isn't a game. It's a job where you don't get paid that decieves you into thinking you're doing something fun.

...says Pavel, playing Factorio.

user202729

I don't understand. What's the problem that prevents a computer install Linux by itself?

CMP: Is editing a bad off-topic should-be-on-stackoverflow question to a good challenge on-topic here a good idea?

Οurous

Depends what the intent of the asker was.

user202729

For example this.

The OP is not seen on this site recently.

@ATaco No, unless there is something need to use it. Just returning doesn't affect registers.

Οurous

6:53 AM

That seems like a good edit.

user202729

What's the point in writing x[:] in Python?

Ok no problem.

Surprisingly this can be searched on Google.

Does it clone the list?

New Main Posts

9:19 AM

1

Q: ASCII Hexagon Chain

Problem Draw a hexagon chain x long, each with side of y length Input x - the length of the chain <= 50 y - the length of each side <= 50 Examples x=1,y=1 _ / \ \_/ x=4,y=1 _ _ / \_/ \_ \_/ \_/ \ \_/ \_/ x=3,y=2 __ __ / \ / \ / \__/ \ \ / \ / \__/ ...

code-golf

Anonymous

@user202729 It does a (shallow) copy of the list: tio.run/##K6gsycjPM/7/…

user202729

@user202729 So, yes.

Anonymous

It's important to keep in mind that it only does a shallow copy. The elements are still the same object references, so nested lists will still get modified. You need copy.deepcopy to avoid that completely.

Neil

10:33 AM

@DJMcMayhem (actually it was First Posts that I used to review on SO)

Adám

11:01 AM

CMC: Boustrophedonise. E.g. ["Here are some lines","of text for you","to make a","boustrophedon"] → ["Here are some lines","uoy rof txet fo","to make a","nodehportsuob"] or ["senil emos era ereH","of text for you","a ekam ot","boustrophedon"] (i.e. you decide initial direction)

CMP: Or should I main ^?

user202729

Probably.

Jelly: U¹2ƭ€Y

Adám

@user202729 Whoa, that's short.

user202729

(5 bytes without the Y if use it as monad function)

Adám

@user202729 Probably main?

user202729

Yes.

Anonymous

11:04 AM

@Adám Actually, 7 bytes: ;r'R*♀ƒ (searching for a shorter way)

Adám

Hold off, I'll main.

user202729

Sandbox?

[should every question be sandboxed?]

Anonymous

Most challenges should be sandboxed

Adám

@user202729 Nah, this one is simple enough.

user202729

Simple challenges are more likely to be duplicate?

Adám

11:11 AM

@user202729 I don't use the sandbox as duplication checker.

Anonymous

Simple challenges are more likely to be dupes. Complex challenges are more likely to have unforeseen complications. Sandbox everything. There's no rush.

Anonymous

There's absolutely no detriment to sandboxing a challenge before posting it

user202729

CMP: If two questions are exactly the same, but have completely different winning criteria, should they be considered duplicates?

Anonymous

17

Q: Are two questions duplicates if they have different scoring rules?

My question Just Another Polyglot Hacker! was marked as a duplicate of Write a polyglot that prints the language's name. Now, our scoring rules are completely different. Why are they considered dupes?

discussion faq-proposed

Adám

@user202729 No. E.g. One is golf and the other fastest-code.

user202729

11:15 AM

Oh ok. (which is what I expected)

Christopher 2EZ 4RTZ

11:37 AM

I always find it interesting that we always have a bunch of people in TNB but they don't chat very often

cough Dennis cough

New Main Posts

2

Q: Boustrophedonise

Related but very different. A boustrophedon is a text where every other line of writing is flipped or reversed, with reversed letters. In this challenge, we will just reverse every other line, but leave the actual characters used intact. You may chose to reverse the odd numbered or the even num...

code-golf array-manipulation typography text-processing

dzaima

@Christopher2EZ4RTZ I don't chat unless there is a reason to.

Christopher 2EZ 4RTZ

@dzaima Well that can't happen much :P

New Sandboxed Posts

11:48 AM

0

A: Sandbox for Proposed Challenges

Google Doodle Kids Coding-style simulator One input is a list of commands. There are three action commands and a loop construct. There is some flexibility as to the command format: As a string or equivalent: The loop construct should use a pair of matching brackets. The direction commands shou...

user202729

12:07 PM

@NewSandboxedPosts I was just going to sandbox this...

Huh, the rabbit dies?

flawr

1:18 PM

@Riker something for you: reddit.com/r/MurderedByWords

New Main Posts

2:18 PM

-1

Q: brainfuck "Happy Holidays"

Print Happy Holidays in brainfuck with as few characters as possible. Here's my naive solution, where I just use the previous character to get to the next character: -[------->+<]>-. #H [--->++++<]>+. #a -[++>-----<]>.. #pp +++++++++. #y -[---->+<]>++. ++++[->++<]>. #H -[--->+<]>++. #o ---. #l -...

code-golf brainfuck

J. Sallé

@NewMainPosts Dennis FGITW'd this with the closehammer

New Main Posts

2:32 PM

1

Q: Encode Factor Trees

I once saw on the xkcd fora a format for expressing numbers in an odd way. In this "factor tree" format: The empty string is 1. Concatenation represents multiplication. A number n enclosed in parentheses (or any paired characters) represents the nth prime number, with 2 being the first prime ...

code-golf primes factoring

user202729

When does the "Review queues" icon have a red dot notification?

dzaima

@user202729 cause SE is too lazy to make it update properly or something.

New Main Posts

2:47 PM

0

Q: Advent Challenge 7: Balance the storage carts!

<< Prev After some careful analysis, Santa was able to determine the dock size ranges and get the presents into the correct transportation dock. Now, he needs you to help him balance out the transportation carts and place the presents in them in the most balanced fashion. Challenge You will b...

code-golf math array-manipulation matrix

Anonymous

3:01 PM

@user202729 When the number of outstanding review jobs reaches a certain threshold iirc

user202729

@HyperNeutrino Probably ÆfÆC$ÐLŒṘṖḊ will work too.

HyperNeutrino

oh is that valid output format? cool :D

user202729

ÆfÆC$ÐLŒṘ€ should work too.

Yes, any bracket is allowed, and other are ignored.

BTW I pinged you ~4 times in OEIS room, if you didn't notice that (sorry for spamming though)

HyperNeutrino

cool :D I'll try to use that to golf it down more. Thanks! :)

@user202729 oh whoops, sorry, I forgot about the notifications :(

user202729

because you get too much notification...?

Unfortunately you should only call ŒṘ exactly once. ¡ might work.

ÆfÆC$¡ŒṘ€ probably works. Need more test cases.

HyperNeutrino

3:18 PM

@user202729 No I'm just bad at remembering things

I'm now 5 days from Fanatic and 31 score from gold code-golf. I think I might end up getting Fanatic first :p

I don't answer enough :p

user202729

3:49 PM

Any idea which format is this? Search for .w file format doesn't help. (this is overkill for the next OEIS sequence, but it is suggested by KSmarts, and I like learning new things anyway - if I failed I will use brute-force solution)

(of course it is readable by itself, but some formatting is great)

caird coinheringaahing

@user202729 I believe that's (La)TeX

user202729

I also thought so. But how am I supposed to view it? Tried some Latex online sites and it give a lot of errors.

caird coinheringaahing

ಠ_ಠ I realised how little anon users' input matters. At school today (about 5 hours ago), I edited one of my answers without logging in, I just check the Edit review queue now and it hasn't come up in the queue at all :/

user202729

Excessive prevention of spam posting.

(just tried on math.se too, it doesn't recognize \.{something}

Anonymous

@user202729 Looks like CWEB

user202729

4:00 PM

Makes sense - the file is even on Donald Knuth's page, and file extension match. Now I need to find a way to render it.

Oh well...

Programs to Read
I write lots of CWEB programs, primarily for my own edification.

Right on the first line...

Anonymous

www-cs-faculty.stanford.edu/~knuth/cweb.html

Anonymous

Use CWEAVE to get TeX, and CTANGLE to get C

user202729

No problem, I get it.

But this seems to be designed for Linux...

NieDzejkob

4:19 PM

a programmer is using windows, lol

user202729

I don't want to use my USB for installing Linux...

What is change file... I can't understand cweb.

Use NUL as change file seems to work.

Nick Clifford

ugh writing unit tests for 300+ components for Ohm is probably one of the most mind-numbing things I've ever done

all my commit messages are the same

"specs"
"more specs"
"oh cool, specs"
"hey guess what it's more specs"

user202729

4:34 PM

(probably) compiled it to tex, but it is full of errors now.

Currently I get polynum.tex

Pavel

._. how do I chmod

I'm trying chmod -r 777 foo but it says that no file 777 found

Oh, nevermind, chmod uses -R for recursive

flawr

@user202729 Can you elaborate this?

@NickClifford are you sure you're not talking about speck (the german word for bacon)?

Nick Clifford

5:08 PM

@flawr oh god I wish

flawr

@NickClifford hungry? :)

KSmarts

5:20 PM

Is today's XKCD about us?

9

J. Sallé

@KSmarts sure as hell looks like it is

New Main Posts

2

Q: Reverse two sections of a string around a pivot

Background I am currently in an AP Comp Sci A: Java class, and I want to start some of my friends on code golfing. I have a challenge from the course, and I would like to see how many bytes the community can do this challenge in. Challenge details: Given two input strings, the main string and...

code-golf string

caird coinheringaahing

Stupid Jelly, splitting strings at letters rather than substrings ಠ_ಠ

New Sandboxed Posts

5:40 PM

0

A: Sandbox for Proposed Challenges

Implement StackSort! stack-exchange-api, internet, code-golf or popularity-contest WIP The alt text for that XKCD says: StackSort connects to StackOverflow, searches for 'sort a list', and downloads and runs code snippets until the list is sorted. Your challenge is to implement StackSor...

flawr

@cairdcoinheringaahing I bet jelly is innocent, and just trying to do whatever you tell it to do.

caird coinheringaahing

@flawr The behaviour makes sense, but isn't desired.

For instance, this

caird coinheringaahing

6:06 PM

CMC: Output all words in Jelly's dictionary

I have 33 bytes in Jelly :P

dzaima

:p SOGL outputting its dictionary is 5 bytes

caird coinheringaahing

@dzaima Hehe, I scrolled to the usernames, and noticed that mine's the very last one :P

HyperNeutrino

Fix for the Mathematica solution for pivot reversing

I was going to comment but I was 5 seconds too late lol

and I can't ping

J. Sallé

@dzaima took me a while to figure out that !! was a single byte

caird coinheringaahing

Clearly SOGL's dictionary is the best as it actually includes jQuery: $("canvas")[0].hidden=false;cp.size(500,500); :P

dzaima

6:15 PM

@cairdcoinheringaahing I'm too lazy to add proper graphics related functions :p

caird coinheringaahing

@dzaima Why is .. in there twice?

dzaima

@cairdcoinheringaahing Good question. At some point I wanted to add a way to not have each word require a space before it, but never got around to it. .. is pointless anyway though, and even less with a space before it

caird coinheringaahing

CMP: Should I force l answers to use the same dictionary for a string compression challenge or leave it up to the answerer to choose whether to use the provided one or not?

trichoplax

I'd go with being specific

caird coinheringaahing

I'm torn between the two. On the one hand, allowing any dictionary is less restrictive, but also allows people with better dictionaries to have an advantage

trichoplax

6:22 PM

(either specify which dictionary, or place very specific criteria on the dictionary they choose for themselves)

Depends on whether you want choice of dictionary to be part of the challenge. People who don't like bonuses and being made to solve the challenge in different ways in order to find which is shortest would probably prefer a fixed dictionary (I don't often answer, but I share that leaning)

caird coinheringaahing

@trichoplax Hmm, good point. I think I'll stick with a constant dictionary, as the challenge is more about compression than choosing the right dictionary

Haha, a variation can apply to most good challenges: "Its about the challenge, not about using the right language/resource/whatever" :P

trichoplax

Yeah there's no way around that except for language specific challenges... Which language, which version, which OS, which specific machine...

flawr

@cairdcoinheringaahing I'm asking because you know jelly: do you understand what they ask?

caird coinheringaahing

@flawr Yeah, he's asking whether it's valid to hardcode the function, or if you have to take it as a string and evaluate it

flawr

@cairdcoinheringaahing Ah so that falls under the standard IO.

caird coinheringaahing

6:31 PM

f=lambda a:<whatever>
g=lambda a, i:<submission>
print(g(input(), f))

Would be the python equivalent

@flawr Yes, if I understand him correctly

flawr

I think I'm gonna post the challenge then probably soonish. Perhaps.

What is the difference between number and integer?

Erik the Outgolfer

well, the former includes non-integers I suppose

Christopher 2EZ 4RTZ

anyone know mathjax?

^

flawr

so is 3.1415 a number?

Christopher 2EZ 4RTZ

yeah

trichoplax

6:42 PM

Do we go with the most specific tag where one is a subset of the other? Or try to use both if there's room?

Erik the Outgolfer

@flawr yes

@trichoplax different people have different opinions

trichoplax

@flawr I was going to jokingly say the difference is that an integer can be non-positive, but I think most people would take "number" to including non-whole numbers in this context

Erik the Outgolfer

and numbers can only be >0?

flawr

Well I just noticed that I'm started interpreting the word number a little bit differently since I got in contact with number theory.

trichoplax

@EriktheOutgolfer I would have been joking about the natural numbers, which are either positive or non-negative depending on who you ask and what time of day. But numbers in general can be non-whole and negative, in common usage. I wouldn't expect it to include complex numbers or other extensions unless specified (I'm guessing that's much the same for most people but not sure)

dylnan

6:48 PM

I would say a complex number falls under "number" but I think a lot of the time when people say number they don't necessarily mean to include complex or imaginary

trichoplax

I guess it's best to use a more specific term (at least somewhere in the spec)

dylnan

Unrelated but people will also misuse a lot of terms too. In physics people will say "finite" to mean nonzero and it really bothers me. It's so pervasive that even in published papers when people mean nonzero more than half the time they say finite

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Q: Find a Fixed Point

Given an integer x1 and some black box function f: ℤ → ℤ find a fixed point of f in the sequence defined by xk+1 := f(xk). Details A value x is said to be a fixed point of f if x = f(x). For instance if f(x) := round(x/pi)and we have a starting point x1 = 10 then we get x2 = f(x1) = f(10) = ...

code-golf math integer functional-programming

caird coinheringaahing

7:45 PM

@Dennis Out of curiosity, why is this locked?

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Q: How to remind "try not to upvote trivial solutions"

There has been a well-established meta consensus that people should try not to upvote trivial answers, but it is difficult to post reminders of it if it is not included in the OP. The most effective way to alert the viewers would be to directly comment under those posts, but it doesn't really ma...

discussion

Pavel

Anyone here good with SQL? I have a predicament where I have a function definition that needs to reference a table, but the same table uses the function in a constraint. So creating either entity fails because the other doesn't exist yet.

How to solve ._.

Poke

that sounds confusing

i wouldn't say i'm good at sql

but i can take a look

Pavel

CREATE FUNCTION board_exists(id INT)
RETURNS BOOLEAN AS
$$
  SELECT EXISTS (SELECT 1 FROM boards WHERE boards.id = id LIMIT 1);
$$ LANGUAGE SQL;

CREATE TABLE IF NOT EXISTS boards (
  ismain   BOOLEAN CHECK (ismain IS NOT NULL)                                        DEFAULT FALSE,
  parent   INT CHECK (ismain OR board_exists(parent))                                DEFAULT NULL,
  id       SERIAL CHECK (id IS NOT NULL) UNIQUE,
  name     VARCHAR(20) CHECK (name = LOWER(name) AND name IS NOT NULL) UNIQUE,

(Postgre SQL)

Anonymous

@Pavel Add the constraint after creating the function?

Poke

7:51 PM

^

Pavel

@Mego Um, how do I do add a constraint to a column after the table exists already?

Anonymous

@Pavel What flavor of DB/SQL are you using?

Poke

ALTER TABLE foo
ADD CONSTRAINT test_foo
CHECK  (bar = 0)

i think that's correct for postgresql

Pavel

Thanks

Yeah that worked!

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