The Nineteenth Byte

3:05 PM

Question: given a value between 0 and 1: for 0 output an RGB code for a blue color, for 1 output an RGB code for an orange color, all intermediate values output a color in between (all outputs should be evenly distributed)

Leaky Nun

@Downgoat beware how colours should be averaged

and did you mean "CMC" instead of "Question"?

Downgoat

ono, too late to fix now :(

Kritixi Lithos

Write it again

By orange do you mean #ff7700?

Downgoat

yes

CMC: given a value between 0 and 1: for 0 output an RGB code for a blue color (#00F), for 1 output an RGB code for an orange color (#F70), all intermediate values output a color in between (all outputs should be evenly distributed)

Leaky Nun

now which averaging should be used?

Kritixi Lithos

3:11 PM

There is a builtin for that in Processing

oh wait, rgb code, then that's more verbose

Erik the Outgolfer

Remember, you are free to do whatever you want, as long as the result is correct :)

But this is still unclear, as it doesn't say what averaging to use.

Kritixi Lithos

Output for calling the function with 0, 0.5, 1: -65536 -50176 -35072

I'm sure this is not what Downgoat means

Downgoat

@LeakyNun averaging? Whatever you want, but should all be the same because outputs should be linear

Leaky Nun

@Downgoat did you click my link?

Kritixi Lithos

can we set the background of a graphical window to that colour instead?

Leaky Nun

3:16 PM

@KritixiLithos I think you only have 1 input

Downgoat

@LeakyNun yes

@KritixiLithos uh, sure but it should be somewhere so I can copy for my own code

Kritixi Lithos

@LeakyNun I meant f(0), f(0.5), f(1)

Erik the Outgolfer

@Downgoat What "your own code"?

Downgoat

rgb is not logarithmic color AFAIK

Kritixi Lithos

@Downgoat what do you mean by that?

Downgoat

3:17 PM

@KritixiLithos meaning I don't want to write function because lazy >_> so outsourcing in form of CMC

Kritixi Lithos

In Processing, lerpColor(#ff0000,#ff7700,g); gives the colour you want (returns a color) where g is the value between 0 and 1

you can surround that in background() to set the background of the sketch to that colour, but printing the colour will give weird results (as it always does)

If that's what you want

The full function is 52 bytes, int f(float g){return lerpColor(#ff0000,#ff7700,g);}

Leaky Nun

Python 3, 42 bytes: lambda n:hex(int(16777471+16741889*n))[3:]

@Downgoat but you still need to take the root-mean-square average if you want to look good

Downgoat

> lerpColor

Kritixi Lithos

If you want, you can see the source for lerpColor here

Downgoat

Idk why but this name amuses me

Leaky Nun

3:26 PM

@KritixiLithos lerpColor doesn't use beautiful color averaging :(

@Downgoat beautiful version

Kritixi Lithos

@LeakyNun well, the results are beautiful

Leaky Nun

@KritixiLithos can you show me?

Downgoat

Question: what is good API to get image of given geolocation

Kritixi Lithos

@LeakyNun Here is a folder of pictures on GH. This is a part of my grapher project that is planned to be a library for Processing (and can be used for golf)

Leaky Nun

Not bad

Kritixi Lithos

3:33 PM

the auto_fit and heart pictures are created with equations from PPCG challenges

Tbh there is supposed to be more than two commits there, but something happened and all previous commits got erased

Riker

@betseg lol, I thought this was you:

Arjun, India

717 4 21

and I was quite confused for a moment

betseg

wow

Riker

he's 12 rep above, as of 30 minutes ago

betseg

is it caching that martin seems higher to me

Riker

prolly?

imma remove for now actually, as it's not that far above

likely caching on one/both sides

martin appears as 952 for me, dennis as 962

betseg

3:41 PM

dennis at 944, martin at 992 for me

Kritixi Lithos

^ that's the same for me

Riker

damnit, I either misread or caching is seriously laggy for me

Leaky Nun

Poll: which one is more beautiful? The top one or the bottom one?

Kritixi Lithos

top one

Leaky Nun

@Downgoat you?

Downgoat

3:49 PM

Top one

Leaky Nun

w3schools.com/code/tryit.asp?filename=FF661V99PWX3

The top one uses root-mean-square averaging, while the bottom one uses linear averaging

Downgoat

Oh huh

Jan Dvorak

Anything w3schools says is irrelevant

Leaky Nun

@JanDvorak I just typed codes there

Downgoat

Wow thanks

Jan Dvorak

3:51 PM

Jsfiddle won't do?

Leaky Nun

@JanDvorak I don't see how you can reject facts

@JanDvorak I haven't tried

Jan Dvorak

Jsfiddle is far better than W3schools' tryit editor, even if we don't judge by the author

Leaky Nun

Alright, will use Jsfiddle next time

Jan Dvorak

I'd suggest trying gamma-corrected linear

Erik the Outgolfer

@LeakyNun top ofc

Jan Dvorak

3:53 PM

just interpolating sRGB code points won't get something that's actually linear

Conor O'Brien

@LeakyNun I kinda like the bottom one better, but the top one looks more realistic

Leaky Nun

@JanDvorak I'm not the expert on colors :p

Jan Dvorak

Time to learn ;-)

Kritixi Lithos

whoops, my Processing function was wrong, it did red to orange instead of blue to orange

That's what lerpColor gives me ^

Leaky Nun

@KritixiLithos I saw the code. It's definitely linear.

github.com/processing/processing/blob/…

       return ((PApplet.round(a1 + (a2-a1)*amt) << 24) |
              (PApplet.round(r1 + (r2-r1)*amt) << 16) |
              (PApplet.round(g1 + (g2-g1)*amt) << 8) |
(PApplet.round(b1 + (b2-b1)*amt)));

Kritixi Lithos

4:01 PM

In this challenge about colour gradients, I did not use sqrt for the gradient and got this result

betseg

I golfed an answer to 1336 bytes, missing 1337 by a byte

Jan Dvorak

*linear in sRGB

Erik the Outgolfer

You won't regret it, that's for sure.

Jan Dvorak

not in intensity, though

Erik the Outgolfer

@johnathanallen It is a context free grammar. I don't know if it is standard but it's the notation I learned in uni. — Wheat Wizard 2 hours ago

Lol why does Jonathan's name get typo'd all the time? I don't get it.

Riker

4:15 PM

because there are ridiculously many spellings of jonathan

Kritixi Lithos

or because wheat was on mobile

You don't get @ auto-completion

Huh, I usually do

I meant on the app

What

The SE app doesn't give you @ auto-completion

Sherlock9

4:16 PM

Ah, makes sense.

betseg

You don't get @ completion on mobile site too

Sherlock9

Ah, I'm probably thinking of auto-completion in chat

The chat in has auto-completion in all versions. The site doesn't, IIRC

Kritixi Lithos

@Riker people have typo'd my name several times, but there is only one way to spell my name :P

betseg

Lol

Erik the Outgolfer

@Riker I have seen people typo'ing that name some 2-3 times in the past too though. Is his name really that difficult?

Sherlock9

4:19 PM

@betseg As an example. Hi, I autocompleted your name from mobile

betseg

Yeah my brain borked for a second

Kritixi Lithos

the SE app always borks

Leaky Nun

@betseg I haven't heard (seen) "borked" for a long time

Erik the Outgolfer

borked = fubar

Leaky Nun

I know what it means

Kritixi Lithos

4:22 PM

what's a fubar?

Erik the Outgolfer

f***** up beyond all recognition

Leaky Nun

fxxxed up beyond all repair

betseg

Which one :D

Erik the Outgolfer

both

Sherlock9

Math pun: Please exercise caution when posting homework questions on SE. You may leave quadratic residue.

Leaky Nun

4:31 PM

Related CMC:

9 hours ago, by Leaky Nun

CMC: quadratic residues mod n

Erik the Outgolfer

@Sherlock9 %?

Sherlock9

Percent?

Leaky Nun

Where is Maltysen gone? Haven't seen him around

Erik the Outgolfer

@Sherlock9 mod

It means Mod?, and what is implied here.

Sherlock9

:D Ah yes, and if you leave quadratic residue everywhere, you may run into trouble with the mods.

And the "mod n" man

Erik the Outgolfer

4:34 PM

@LeakyNun Maltysen's been inactive for a while now.

Sherlock9

(read: modern)

What about minxomat?

Leaky Nun

@EriktheOutgolfer do you know why?

@Sherlock9 are you going to do my CMC?

Erik the Outgolfer

@LeakyNun Nah I currently don't.

Riker

@Sherlock9 he's on a diff time zone than most of TNB, but I've seen him occasionally when I'm up late/early

mostly around 2-4 am my time

Erik the Outgolfer

I'm in GMT+2 summer time and I've often seen him active.

Riker

4:37 PM

ah, okay

I'm like 7 hours behind you, and I don't see him that much

Sherlock9

Python 3, 34 bytes: lambda n:[k*k%n for k in range(n)]

mınxomaτ

@Sherlock9 Huh?

Erik the Outgolfer

@Sherlock9 There is an addendum which says that it must be sorted and uniquified.

Although I'm not sure if it applies here.

Sherlock9

Huh. Alright

@mınxomaτ Good to see you :D

Wondering how the podcast is going

mınxomaτ

I'm mostly here between 8am and 3am+1d (my time)

Leaky Nun

4:39 PM

@mınxomaτ utc?

Sherlock9

Which time zone are you in?

mınxomaτ

CEST or CET

Sherlock9

UTC+1 then

0700 to 0200+1d UTC

mınxomaτ

@Sherlock9 I'm currently moving, so I don't really have any time for anything. I'll update yall mid-May

Erik the Outgolfer

@Sherlock9 Here is the addendum for reference:

9 hours ago, by Leaky Nun

oh, and it should be unique and sorted

Sherlock9

4:42 PM

@mınxomaτ Fair enough. Good luck and safe travels

@EriktheOutgolfer Thanks

Leaky Nun

@Sherlock9 you're busy?

Sherlock9

Kind of

Leaky Nun

alright

Sherlock9

Mostly I figured you'd already got a bunch of responses

Leaky Nun

not really

Sherlock9

4:56 PM

Ruby, 35 bytes: ->n{(1..n).map{|k|k*k%n}.sort.uniq} tio.run/nexus/…

Leaky Nun

@Sherlock9 nice

Dennis

@Riker It's April 30, not April 1.

Erik the Outgolfer

Huh? What happened?

Sherlock9

Jelly, 6 bytes: Ḷ²%µQṢ tio.run/nexus/jelly#@/9wx7ZDm1QPbQ18uHPR////DQ0MAA

Leaky Nun

@Sherlock9 nice

Erik the Outgolfer

5:04 PM

I have made a 6-byte version too though. And it's almost identical: Ḷ²%µQṢ.

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Useful Golfing-Language Commands I as well as others are working at making golfing languages. What are some useful commands that we could include? As usual, please post one tip per answer, except for the "generic commands"1 answer. If a command has an inverse, (like + is the inverse of -), plea...

Sherlock9

@EriktheOutgolfer I think that is identical

Leaky Nun

@EriktheOutgolfer that wasn't what you came up with

Erik the Outgolfer

Whoops I meant Ḷ²%⁸QṢ.

DJMcMayhem

5:22 PM

@WheatWizard Personally, I think your formal grammar description of balanced strings is not very user friendly. I understand it, but I had to have it explicitly explained to me. I don't think the average user will have any clue what it means

LegionMammal978

lol

-11

Q: ip address hack

I believe someone knows my IP through accessing public WiFi and accounts such as BT sport. Now I know I'm being monitored but not sure how. I believe this person is a hacker and that they know the latest activity on my phone and laptop. I'm taking the issue further and possibly have a good imag...

ip surveillance

Best part is the OP's comments on the accepted answer

Leaky Nun

CMC: print 7625597484987 (3^27) without using any number

DJMcMayhem

By number you just mean the ASCII digits?

Fatalize

@LeakyNun Brachylog, 10 bytes: ṪlL:L^:L↔^

Leaky Nun

@DJMcMayhem yes, sorry

@DJMcMayhem have you seen my comments on your answer?

@Fatalize could you use backticks?

Fatalize

5:30 PM

What do you mean?

Leaky Nun

ṪlL:L^:L↔^

DJMcMayhem

@LeakyNun Yeah

I'm edit when I'm less busy

Fatalize

It's basically 3^(3^3) with Ṫl producing 3

not the most interesting of things

Kritixi Lithos

Dyalog APL, 11 bytes: (⊢*⊢*⊢)⍴⍬⍬⍬

Leaky Nun

@KritixiLithos what is the header for?

Kritixi Lithos

5:34 PM

Basically does what Fatalize said, with ⍴⍬⍬⍬ producing three

@LeakyNun it sets the precision of the output

remove it and see what happens

Leaky Nun

I see

Kritixi Lithos

And ⍴⍬⍬⍬ basically means the length of 3 empty sets

Conor O'Brien

@LeakyNun C, 58 bytes

Leaky Nun

@ConorO'Brien 13

8

Conor O'Brien

oh

I'm tired

Sherlock9

5:40 PM

Jelly, 7 bytes: “¤‘µ**@

This is probably a little too long

Jelly, 6 bytes: “¤‘**@

I was right

Conor O'Brien

C, 74 bytes

Leaky Nun

@ConorO'Brien congratulations

Kritixi Lithos

@Sherlock9 how does it work?

Sherlock9

My answer works like this:

“¤‘ is the number 3 from Jelly's special ord() function that maps characters to its code page.
* is the first exponentiation to get 27.
*@ is the second but flipped so we get 3**27 and not 27**3.

Stewie Griffin

Comments? codegolf.meta.stackexchange.com/a/12247/31516

Kritixi Lithos

5:49 PM

@ConorO'Brien 68 bytes: i;main(){char*c="WVRUUYWTXTYXW";for(;c[i];)printf("%c",c[i++]-' ');}

Conor O'Brien

oo nice

Sherlock9

There is a little magic involved because I'm not sure where is pulls the second and third 3s from. I assume Jelly automatically repeats old arguments, but I'm not certain.

Kritixi Lithos

@ConorO'Brien I saw an answer saying that C strings end in null bytes, so I just used that here

Sherlock9

@StewieGriffin Ah, hello. I haven't had a chance to thank you for the bounty yet, so - Thank you for the bounty :D

Leaky Nun

@Sherlock9 the chain is niladic

so the first nilad is used as the argument to the remaining chain monadically

Sherlock9

5:52 PM

Ah, thanks for the clarification

Leaky Nun

@KritixiLithos @ConorO'Brien 67 bytes: i;main(){for(char*c="WVRUUYWTXTYXW";c[i];)printf("%c",c[i++]-' ');}

Sherlock9

I'm heading to bed. Goodnight

Stewie Griffin

@Sherlock9 You're welcome :) Both the answer and the challenge were very nice, so you deserved it :)

Leaky Nun

@Fatalize why does ṪlI^ not give 27?

@Fatalize 8 bytes: ṪlI:Ij^ˡ

Outgolfing a language creator :p

betseg

$ cat << EOF | gcc -x c - -o qwe 2>/dev/null && ./qwe
a='Q';main(){printf("%lld",a*a*a*a*a*a*a/('d'-'a'));}
EOF
598878821

doesnt print 7625597484987 wtf

ETHproductions

6:01 PM

TFW you realize you lost the one-byte-shorter solution that you had worked on for an hour :-(

@betseg Um, is it casting to a 32-bit int?

betseg

@ETHproductions oh

Leaky Nun

@betseg (81^7)%(2^32) / 3 = 598878821

betseg

@LeakyNun C, 64 bytes (CC @ConorO'Brien)

Leaky Nun

@betseg C, 63 bytes

@betseg C, 59 bytes

betseg

i was just testing and failing this 63 byte program

@LeakyNun wait wat

Riker

6:07 PM

> trojan win 32 dynamasta

Leaky Nun

@betseg C, 54 bytes

Riker

lol wut

betseg

@LeakyNun remove b, 53 bytes

Riker

I get trojan win32 but what's "dynamasta"

Leaky Nun

@betseg right

betseg

6:08 PM

is there an escape character in a

Leaky Nun

yes, it is U+0018

Stewie Griffin

Anyone here got a post deleted due to "Offensive" flags?

Leaky Nun

@betseg C, 47 bytes

Jan Dvorak

@StewieGriffin o/

Stewie Griffin

Anyone know how much negative rep you get? Spam is automatically -100, but I can't find information about Offensiveness.

Jan Dvorak

6:10 PM

just a chat message, though

betseg

oh its smaller than i thought, fits in a long

Jan Dvorak

offensive posts on main are -100 as well, any combination of six red flags works.

chat messages are 30 minutes per

Stewie Griffin

@JanDvorak, OK :) Reason for asking. :)

Jan Dvorak

ok

DJMcMayhem

@LeakyNun I know you posted that a while ago, but brain-flak, 50 bytes: (((((()()())){}){}()){}){({}<(({})({}){})>[()])}{}

Leaky Nun

6:18 PM

@DJMcMayhem nice

Stewie Griffin

@DJMcMayhem what are you all golfing here?

DJMcMayhem

51 mins ago, by Leaky Nun

CMC: print 7625597484987 (3^27) without using any number

Thankfully, constant exponentiation is very terse (relatively speaking) in brain-flak

Conor O'Brien

6:34 PM

are linear-access hash tables really that bad?

Leaky Nun

@DJMcMayhem I can't golf that down lol

Luis Mendo

MATL, 7 bytes: It^I^I^

New Main Posts

1

Q: What would your reputation be without the rep cap?

In this challenge, you will calculate what your reputation would be, if the reputation cap didn't exist on PPCG. Everyone can access the rawdata for reputation changes on the adress: codegolf.stackexchange.com/reputation. The raw data follows a setup like this (these are the first few lines of m...

code-golf parsing internet

Stewie Griffin

^^ A challenge where a regular language might win... :) Hope you like it :)

DJMcMayhem

6:51 PM

@LeakyNun That's a high complement coming from you ;)

Conor O'Brien

@NewMainPosts I feel like we've had that challenge before, or something similar

LegionMammal978

Anyone here know how to use bash to cut off all lines in a file after a certain column? Pretty sure sed or something could do that

Stewie Griffin

@ConorO'Brien Really? I haven't found any similar ones. The search function isn't the best though, so there might be a similar one that I just haven't found.

Conor O'Brien

it could've been on SEDE

LegionMammal978

@ConorO'Brien Reminds me most of this

Conor O'Brien

6:57 PM

ah that was it

Wheat Wizard

@DJMcMayhem I like it because it can't be argued with. Any intuitive explanation of what a balanced string is generally is rather vague or relies heavily on extrapolating from examples.

Jan Dvorak

@LeakyNun unclear. What if my language doesn't have a code point specified?

*code page

Conor O'Brien

7:17 PM

@LegionMammal978 if the length is in $col, then sed "s/^$.\{1,$col\}$.*/\1/g" test.txt works

Adám

What does CMC mean?

isaacg

@Adám Converted Mana Cost

Riker

@Adám chat mini challenge

@isaacg I had to check to make sure you weren't geobits

Jan Dvorak

Chip microcontroller

betseg

cdon't munderstand cabbreviations

3

Riker

7:31 PM

14 hours ago, by Helka Homba

Geobits is cackling madly somewhere

Jan Dvorak

I can cackle too

Fatalize

@LeakyNun I never think about using left fold

Adám

@Riker Thanks.

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Digit Words Question 1 on here. Test cases can be found here. Functions are allowed as well as programs. Make your code as short as possible.

0

A: Sandbox for Proposed Challenges

Insist on an answer Keep prompting for input until the user inputs something, i.e. does not just press Enter or OK. code-golf

Riker

@NewSandboxedPosts seems good to me, could use a bit more clarification though

specifically, does the input have to be runtime? what if that's the default behavior of the interpreter?

and does a blank newline count as empty input?

cc @Adám, since chat messages are easier to respond to (imo) than comments

betseg

7:40 PM

CMC: greet someone code-bowling natural-language

Riker

code-bowling?

lol

I can get a 1 byte solution though, e (english). pronounced "ey" or "eh"

betseg

not golf

lel

Riker

@betseg "salutations, my most golfiest of golfers, how be thy doings today?"

@Riker why did this get 7 stars

it's a stupid avatar joke lol

Phoenix

A very good day to you, fellow code-golfer, how are you feeling at this fine hour of the morning?

Riker

Phoenix

7:57 PM

If that car belongs to physical security, then it's in a private MS parking garage and the person who took this photo probably works at Microsoft.

Stewie Griffin

8:50 PM

@Riker Well, at least you don't have to assemble it yourself...

muddyfish

And I finally got a Pyke interpreter up again but it's moved to http://dustbunny.catbus.co.uk:5000/. Is it possible to have two domains map to the same IP?

Dennis

9:08 PM

Sure.

MicroTransactionsMatterToo

Anyone used dc for golfing?

Looks like a good challenge

Also, hello

betseg

i cant see your name ಠ_ಠ

MicroTransactionsMatterToo

You can't? Shows up fine for me. It's MicroTransactionsMatterToo

betseg

i can see it when i click your avatar but not here

MicroTransactionsMatterToo

Might be too long

betseg

9:15 PM

probably

MicroTransactionsMatterToo

Anyway, dc is a stack based calculator for Unix

betseg

ik

MicroTransactionsMatterToo

Seems like the kind of language one might use for golfing

Currently working on a list of languages to learn

Dennis

@MicroTransactionsMatterToo Indeed.

14

Q: Tips for golfing in dc

What general tips do you have for golfing in dc? dc is a calculator utility for UNIX/Linux that predates the C language. I am interested in how to make my dc programs (calculations?) shorter. I'm looking for ideas that can be applied to general code-golf that are at least a little bit specific ...

code-golf tips dc

MicroTransactionsMatterToo

Yeah, just thought I might as well mention it :)

Anyway, what're you up to?

betseg

9:31 PM

MicroTransactionsMatterToo

Not sure what that is without context. As far as I can tell, you manage to run out of memory for NodeJS

Rather, you have too many nodejs processes running

betseg

found in reddit, check the highlighted line

> kill process or sacrifice child

MicroTransactionsMatterToo

I'm guessing it means child process. But yeah, it's a rather amusing phrasing

Well, going to start learning Common Lisp

Never been great at purely functional languages, although I enjoy using Prolog and APL

Adám

@MicroTransactionsMatterToo What have you done in APL?

MicroTransactionsMatterToo

Not a huge amount, I've done quite a bit of playing around in it, and used it to cull some datasets I had, but then gave up when I tried to work out outputting data to a file.

Adám

9:57 PM

@MicroTransactionsMatterToo That's pretty easy though. Especially in Dyalog APL 15.0: (⊂txt) ⎕NPUT 'writing.txt'

MicroTransactionsMatterToo

Yeah, but outputting formatted text isn't as simple

Needed to output JSON, and APL isn't amazing at that sort of thing, better at manipulating arrays and matrices

Adám

@MicroTransactionsMatterToo 7160⌶MyAplArray returns the JSON equivalent. In version 16.0 (beta this week) it will be 1 ⎕JSON MyAplArray.

Riker

10:15 PM

opinions on the formatting here?

Adám

@Riker I think it is neat to see the development at a glance. Obviously, in code-golf, the shortest line is the current entry, so the <s> is just annoying. However, I don't see the need to move the old solutions to a different section.

Dennis

13

Yes!

Adám

@Dennis Wow, congrats.

Riker

@Adám hm, okay

@Dennis I was too early :p

@Adám I also didn't like the codeblocks not being blocks

Adám

@Riker No, he's 2 ahead right now.

Riker

10:20 PM

no I was

Adám

@Riker oh, huh? I misread.

Riker

no, I posted that eralier

but I misread

Adám

@Riker rounding error?

Riker

lol, no, I just misread 6 for 9

Adám

@Riker They are the same; it's just a matter of perspective.

Riker

10:21 PM

lol

Adám

@Riker When my father taught me the alphabet, I argued that he was still my father whether his belly faced the window or away from it. Therefore, b and d are the same letter.

Riker

lol

betseg

you know, someone (or some people) designed the lower case letters and we will be using them for at least couple of thousand years

Adám

@betseg I don't think they were designed. They just naturally transformed by slight variation in transcription, eventually turning into what we have today. However, the general modern forms probably won't change much more, due to our effective storage media.

Phoenix

10:43 PM

@Dennis Nice!