The Nineteenth Byte

New Main Posts

00:13

1

Some trading cards have real value and can be sold for money. Bending the cards is frowned upon because it takes away their value and makes them look less new. Say you have a deck of trading cards (Pokemon, Magic, etc.) and you want to shuffle them. Instead of doing the bridge that bends all of t...

Doorknob

01:06

@El'endiaStarman Yeah, they don't really make much sense in the context of PPCG

El'endia Starman

I figured.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

"Post notice"?

Doorknob

ex. the one on this answer

Cᴏɴᴏʀ O'Bʀɪᴇɴ

OIC

That's kinda cool

PhiNotPi

02:21

@Justin I've been curious, when exactly did you change your username?

Justin

7

Q: Etiquette for username changes

I'm thinking of changing my username to my real name. Given that I have a presence on some of the sites here (mostly codegolf), what etiquette should I follow when choosing my new name? As my username is currently Quincunx, I'm thinking of changing it to MyRealName (formerly Quincunx). Or perhap...

discussion etiquette usernames

PhiNotPi

okay

Justin

I've been keeping my avatar so people can recognize me

Sometime I might change it to something else

Dennis

@Justin I would have suggested The Justin formerly known as Quincunx. :P The avatar helped a lot with the transition though.

Justin

Argh. Can't scan an image with 2400 DPI. Maybe I should try a lower DPI

PhiNotPi

02:32

42

Justin

42 DPI?

PhiNotPi

If that's still too high, try 7.

Justin

I'm going for higher numbers first

I think 1200 might work :)

I actually don't need to scan this

I'm scanning for fun

Sweet it worked

Is 23 MB a big image?

It's only 10200 by 14028 pixels.

Dennis

@Justin That depends on the format.

Justin

PNG

This is crazy how much I can zoom in. I love it. Scanning took only about 5 minutes too

Dennis

02:36

Pretty big for PNG. :)

Justin

I'm going to scan it again as a TIFF this time

Now I can finally get to entering in my information for receiving swag

Dennis

Try Portable PixMap (ASCII).

Justin

The scanner doesn't support that

It supports BMP though

And JPG

El'endia Starman

BMP would probably be the biggest.

Justin

I'll try that next

What would be cool is if there was an svg option. Like if the scanner performed OCR and constructed paths.

Dennis

02:40

True color BMP should give a nice 570 MB. The PixMap should be closer to 1.5 GB.

Justin

Nice

* Your First / Last name *

Does this mean I'm supposed to write in the field: FirstName / LastName?

Or does it mean "first name or last name"?

Dennis

Looks like either/or.

Justin

Oh...

I put FirstName / LastName

Dennis

Probably not what they mean though.

Justin

Let's change that

They should have been clearer

Is this an appropriate question for MetaSO?

I'm curious how many downvotes it would attract

Dennis

02:42

If it's an SO form, sure.

Justin

7 minutes of scanning... halfway there

PhiNotPi

Meme: "Attract ALL the downvotes"

Justin

Is this a discussion or a support question?

Dennis

Support.

Justin

Okay

Dennis

02:44

@PhiNotPi We have a winner:

-214

A: Can we have the ability to retract a close vote before it closes?

declining -- you can always cast a reopen vote if the post gets closed. Also note that all close votes automatically expire after two days. (and for that matter reopen votes, or any other vote that attempts to reach a threshold -- otherwise, over an absurdly long period of time, say 10 years, e...

Justin

Surprisingly, the tif is smaller. I thought tiffs were uncompressed, but pngs losslessly compressed

bmp time

Dennis

BMP is uncompressed. TIFF can be uncompressed, but any sensible scanner/scanning software should use the compressed form.

Justin

Okay

I read a blog post by some strange person who believes that lossless compression isn't lossless

PhiNotPi

You could JPEG it.

For extra-special compression.

Dennis

@Justin People believe all sorts of crazy things.

Justin

02:51

The guy doesn't trust the math...

Dennis

Like how their hard disks shrink by formatting them, when they simply don't know the difference between MB and MiB.

(That's totally Microsoft's fault though.)

Justin

There we go:

0

Q: What does "Your first / last name" mean?

Today I received the long-awaited email: I eagerly opened up the email, then followed the link to the form: As I began to fill out the form, I got very confused. What does Your First / Last name mean? I filled out the logical answer: FirstName / LastName. Later I reflected on it... was I su...

support 10m-questions-milestone

Oh my goodness! For a BMP, it managed to scan at 2400 dpi. I didn't have to reduce to 1200 dpi.

1.59 GB

Doorknob

@Justin Pretty sure it just means Quincunx McFiveMan (or whatever your first and last name is, although I'm pretty sure I've got it right).

Justin

Ha . ha . ha.

Why can't windows 10 open a BMP?

Dennis

All BMPs or just 1.5 GB ones?

Justin

03:00

I don't know

I don't really want to make a smaller bmp to check... oh well. Paint.NET here we go.

Hmm... it looks like an error in the bmp. Paint.net gave me the following:

System.ArgumentException: Parameter is not valid.
at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData)
at PaintDotNet.Data.BmpFileType.OnLoad(Stream input) in d:\src\pdn\paintdotnet\src\PaintDotNet\Data\BmpFileType.cs:line 95
at PaintDotNet.FileType.Load(Stream input) in d:\src\pdn\paintdotnet\src\Data\FileType.cs:line 496
at PaintDotNet.Functional.Func.Eval[T1,TRet](Func`2 f, T1 arg1) in d:\src\pdn\paintdotnet\src\Base\Functional\Func.cs:line 158

Dennis

The real question is: Why can your scanner make 2400 dpi BMPs but not 2400 dpi PNGs?

2

Justin

I have no idea

Is there a good tool for fixing corrupt metadata? Because it looks like the BMP has corrupt metadata

Dennis

I suspect an error in the parser, which wasn't expected to handle 1.6 GB pics.

Justin

No parser at all?

sublime text, paint.net, paint, photo gallery? All of them aren't equipped?

Dennis

Wouldn't be alone: artwork.com/gerber/vlbv/bmp_support.htm

Justin

03:13

sucks...

Dennis

The Very Large Bitmap Viewer should work, if you can spare the 2,500 dollars.

Justin

If I could spare the 2500 dollars, I'd get photoshop

Dennis

Which doesn't work with high-res BMPs.

Justin

Yeah.

I'd get photoshop for other purposes.

I wonder if IrfanView works...

Dennis

I'm not really skilled in image manipulation. For my occasional needs, GIMP is more than sufficient.

Justin

03:17

I rescanned as 1200 dpi bmp

It's 400 MB instead of 1.59 GB. Also instead of the ~20MB of PNG and TIFF

Dennis

Does that BMP work?

Justin

Yes

1200 dpi is actually very good. One pen-width can be zoomed to about an inch tall

Trying 2400 dpi jpg now

Dennis

GIMP seems to have the same issue Photoshop does. I downloaded this 31591x31517 BMP. Opening '/home/dennis/1800dpi.bmp' failed: '/home/dennis/1800dpi.bmp' is not a valid BMP file

Gwenview can open it just fine.

Justin

Hmmm. Can Chrome open image files?

Yes it can. Trying it on the bmp

Dennis

Doesn't work.

Justin

03:22

Just you wait... chrome will crash on me

Cool, at least Chrome informed me there wasn't enough memory

Let's try Microsoft Edge. I expect it to fail

Edge silently fails, putting a little x on the top left corner of the screen

Or should I say top left edge of the screen.

the jpg didn't work

took 7 minutes to fail at scanning it all

Dennis

@Justin That's pretty similar to what Chrome did (broken image instead of edgy x).

Justin

Chromes message actually told me something. Edge barely did

200 dpi is way faster than 1200

xnor

@El'endiaStarman Would you like more golfing suggestions on your answer?

Justin

It feels about 6 times faster, coincidentally.

El'endia Starman

@xnor Sure.

xnor

03:34

the fact that Python 3 has map objects is annoying

a shorter hack to convert to a list is by unpacking *z,=

choosing one of two things to print is generally shorter inside the print function

Sp3000

@xnor Out of curiosity, have you tried the 16 bit one?

xnor

@Sp3000 nope, i've done too much ascii art

El'endia Starman

@xnor I don't see how to get that to work with ["uneven",*z] and "even".

Sp3000

Ah :P k

El'endia Starman

@Sp3000 That was a fun one to do in Befunge.

xnor

03:38

@El'endiaStarman so you're trying to print(*_) one of two lists, ["even"] or ["uneven"]+z

El'endia Starman

ahh

yeah, that works

xnor

i suspect there's a still better method though

Sp3000

What are we trying to do?

El'endia Starman

print(*[["uneven"]+z,["even"]][z[:-1]==z[1:]]) is what I've got thus far.

xnor

"even" and "uneven" share a lot of chars

El'endia Starman

03:41

s='even';print(*[["un"+s]+z,[s]][z[:-1]==z[1:]])

That's longer.

xnor

yeah

but you can do "un"*_+"even"

El'endia Starman

mm

Sp3000

b=z[:-1]!=z[1:];print("uneven"[2-b*2:],*z*b)

xnor

that's what I had too

the *z*b sure looks funny

El'endia Starman

yeah

I would have come up with...

Sp3000

03:43

As far as I can tell, splat is last, so you can even do *L1+L2 for L1, L2 lists

xnor

'un'*b+'even' is shorter than "uneven"[2-b*2:], right?

El'endia Starman

b=z[:-1]!=z[1:];print("un"*b+"even",*z*b)

Maybe.

Sp3000

Clearly I didn't try hard enough :P

xnor

i think it was more trying too hard :P

while we're at it, is there a shorter way to check if a non-empty list has all equal elts?

z[:-1]!=z[1:] and len(set(z))>1 are the same length (for the negation)

Sp3000

I do believe they're the ones that came up in golf practice

xnor

03:46

as is z!=z[1:]+z[0]

oh yeah, no wonder it seemed familar

the only hope is that the negation is shorter

set(z)>{z[0]} is also as long

Sp3000

Unless you Python 3.5 it :P

xnor

oh right!

Sp3000

len({*z})>1

El'endia Starman

[blinks]...what's new?

Ooh, nice.

xnor

so that's 2 chars off of set conversions

El'endia Starman

03:50

Unfortunately, I'm using Python 3.3, so I don't think it'd be fair for me to use that feature.

Sp3000

Python 3.5.0 is actually officially out as of 6 days ago

So I think it's perfectly fine :P

El'endia Starman

Eh. Alright, I'll include both versions in my answer.

What I want to know, though, is what to do with z=list(map(t.count,set(t))).

18 mins ago, by xnor

a shorter hack to convert to a list is by unpacking *z,=

Sp3000

*z,=map(...)

El'endia Starman

Ah!

That makes sense!

xnor

unrelatedly, there's isn't a % string format that trims a string/number to a length, is there?

i don't think there's any based on this: docs.python.org/2/library/stdtypes.html#string-formatting

but i don't understand what all the flags do

Sp3000

03:55

Example?

xnor

"%?2s"%"abcd" == "ab"

ideally combined with padding if the string is too short

Sp3000

Not with % I don't think...

xnor

well, i'm at a total loss for 3 chars on this: golf.shinh.org/p.rb?not+PI

Sp3000

Seems like .format can, but well... .format

Justin

What is that site?

xnor

03:58

@Justin anarchy golf

it's a long-running competitive golfing site in many langs

Justin

Okay

Never seen it before

Do you think I need to explictly define what "object" means, since I'm allowing things that don't strictly have classes (e.g. C, Haskell) meta.codegolf.stackexchange.com/a/7002/9498

Sp3000

Hm 47

xnor

@Justin do you simply means things that have a state?

Justin

I don't understand the question

> You must make a state machine class. Sorry, this means that only languages with objects can compete. If there is an accepted alternative to objects in your language, that is valid

xnor

when you say languages with "objects", do you mean data types that have a mutable state?

Justin

04:04

I mean languages with objects. Haskell doesn't have mutable state, but it has a concept of a type/object

I think it should be fine for someone to write Haskell code for this.

I could possibly restrict it to mutable state, but that cuts out languages... I don't know if that's a good or a bad thing

I guess I'm trying to say that GolfScript doesn't have objects. You could make a list and call it an object, but that's not really an object.

C has structs, but the structs can have member functions, and are often used in OOP, so I rekon it should be fine to allow C.

I guess there actually isn't much of a difference between my golfscript idea and my C idea...

And my golfscript and haskell ideas

Sp3000

@xnor I have a really stupid idea which might work but I'll have to think it through...

xnor

that's a promising thing to hear :-)

Sp3000

... nope nvm D:

xnor

if your stupid idea was the same as my stupid idea, to represent the decimal mathematically, python won't compute to that accuracy

Sp3000

Ahaha no, not that

I was thinking of doing something like the `L`[2::5] thing

xnor

04:10

oh, haha

Sp3000

... give me a sec :P

xnor

hmm, hallvabo used to participate on PPCG years ago

i wonder if they still check PPCG

@hallvabo hi!

Sp3000

@xnor Got it, but this is so stupid

print"3."+`range(10140004,11140000,10001)`[3::5]

5

xnor

hahahahahaha

that's brilliant

Justin

@Sp3000 What is this code for?

The anarchy golf?

Sp3000

04:20

Yeah

xnor

that is the best repr abuse I have ever seen

Justin

Definitely

Sp3000

For some reason, that was my second thought at seeing the question, but it's a byte longer currently :/

print"3."+`range(114004,214000,1001)`[2::4]

Got it!

Shoot I beat hallvabo

xnor

congrats!

Sp3000

(Sorry, I'm still laughing over here :P)

Justin

04:23

That's... impressive

Sp3000

@El'endiaStarman For the 3.5 one you can do {*t} for the other set call as well :)

Basically, in Python 3.5 you can join sets by splatting, e.g.

>>> {*{1, 2, 3}, *{3, 4, 5, 6}}
{1, 2, 3, 4, 5, 6}

El'endia Starman

Ooh, indeed.

Justin

I think I want Python 3.5

Sp3000

04:42

Wow xnor's rugby answer has so many ks and ns :P

New Main Posts

05:07

0

Q: The Sine of Greatness

Introduction Everyone's heard of sine (sin), cosine (cos), tangent (tan), and secant (sec). Every angle has them. Far less known, or remembered, are the exsecant (exsec), cosecant (csc), excosecant (excsc), versine (versin), coversine (cvs), and cotangent (cot). Every angle has those as well. T...

code-golf math trigonometry

El'endia Starman

05:25

@Sp3000 Are there lots of clashes?

Sp3000

Well I was just surprised at the k/n/n,k/n%n,k%n route, but I can't think of anything better

El'endia Starman

So you're saying it's a touchdown for him?

New Main Posts

07:17

0

Q: Counting the Endpoints of an ASCII Art

You should write a program or function which receives a string representing an ASCII art as input and outputs or returns the number of endpoints in the input. The input will consist of the characters space - | + (with 0, 2, 2 and 4 endpoints respectively) and linebreaks. E.g.: -|++- + Two a...

code-golf ascii-art counting

Sp3000

08:50

@xnor Darn... until I saw xsot had 42 I didn't realise I could take another byte off. If you want, you can give it a shot - it's a nice puzzle :)

feersum

If you're reading a string from stdin in code golf, can you require the user to quote and escape it?

Sp3000

tbh, I'm still not sure. Up until now there have been many solutions which use Python 2 input() and there haven't been many complaints, but I'm not sure if there's a clear concensus. At one point Vioz- added 2 bytes "for the quotes".

feersum

@xnor's last answer is what I was looking at

xnor

09:14

@Sp3000 Vioz then removed the 2 byte penalty, if we're thinking of the same example

i also think it's common practice, but it could be worth a meta post

Sp3000

I like your grid btw :)

xnor

thanks

the random numbers question made me appreciate the power of string formatting for insertion

and here I said I wasn't going to do more ASCII art...

feersum

I won't do ASCII art...unless I have a 2D language.

Sp3000

How long is tuple(... for ... in)?

xnor

@Sp3000 too bad about that byte

@Sp3000 hmm, i should actually check that

@Sp3000 same length, apparently

Sp3000

09:21

D: wow

@xnor print(a+'| %s '*4+'|\n')*4%s+a

Although... now that I think about it the grid ends with a double newline

xnor

the problem said "Final newline is required."

right, you can substitute first...

Sp3000

Hmm that's a confusing rule... shrugs

Well I guess even if single trailing newline was required, it'd only be an extra byte anyway

flawr

09:43

Do we already have a base conversation challenge?

Peter Taylor

10:37

We already have several dozen

Optimizer

11:11

^

Martin Büttner

13:27

@flawr base-conversion

What happened to the "Why I am leaving Code Golf" post? I feel like it had ten votes less just yesterday.

@randomra I don't understand why you reverted my change to your challenge's spec when it was in the sandbox. I could have sworn that the repeated |\n+ in the list of valid pairs was a typo.

randomra

13:48

@MartinBüttner opps, when I added the examples I copied the whole question from my previous version on my PC

thanks for catching it (twice)!

Doorknob

14:33

2

PhiNotPi

Has there been a Quater-imaginary base conversion challenge?

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

The Algebra of Reflecting Points This is a challenge based on manipulating points with a specific set of operations, each dealing with the reflection of some points over others. Warning: There's not actually a challenge here yet, just the basis for a challenge that could be to "simplify the giv...

Optimizer

@Doorknob no use.

Dennis

14:48

@MartinBüttner Are you around?

Optimizer

15:09

@Dennis You secretly want to discuss the graduation surprise party with him, don't you ?

Martin Büttner

@Dennis hm?

orlp

15:35

@Dennis you here?

you have this answer linked from your profile: codegolf.stackexchange.com/questions/51228/rearranging-words/…

you say that "The minimum number of horizontal moves can always be achieved by pairing the nth occurrence of each letter in the first line with the nth occurrence in the second line."

doesn't that lead to a really simple algorithm?

identify where each character should go

then for each character identify whether it should go to the left or to the right

then in each category (left-moving or right-moving), go from left-to-right (and reverse for the other category) and move the characters one by one

with the only exception that if left-moving character has to go through a right-moving character, only one of the two has to go vertically

orlp

16:41

@isaacg @Jakube do you know any better way to see if all elements in a list J are equal than .AqM.:J2?

.AqLhJJ is one byte shorter

although that messed with the ordering for J =/

.AqM^J2 is also a byte shorter without that problem

!snM^J2 is even better, because it allows you to drop the ! if you want to

aditsu

in CJam it's )-

Optimizer

a sad cyclops?

aditsu

if you say so

Alex A.

17:23

@MartinBüttner What do you mean what happened to it? It's still there...

@Doorknob There should be a qualifier: Except for PPCG, which would devolve into a post-apocalyptic shitscape should it ever reach 10 questions/day.

2

Dennis

@MartinBüttner Nevermind. I was going to ask you if you could take a look at this answer, but somebody already left a comment.

flawr

17:40

@MartinBüttner Oh, used wrong search terms =//

Alex A.

My birthday was yesterday. I should have capitalized on the popularity of the recent birthday challenges by posting my own.

</random_thoughts>

feersum

@AlexA. How does that even make sense? Does round return a string?

Alex A.

No. I just want the zeros.

feersum

In most languages you would use printf("%.4f") or whatever, not round anything

Alex A.

Oh, good idea.

I'm used to SAS where rounding actually applies a format to the numeric value so that when you view it it has exactly the requested number of places but is still a numeric value.

</stupidity>

(Just kidding with the close tag. I can't make it stop.)

feersum

17:54

Sounds confusing

Alex A.

Seriously.

Alex A.

18:14

@feersum Are you a professional programmer?

feersum

nope

Alex A.

What do you do?

feersum

Nothing atm.

Alex A.

Unemployed, student, or both?

feersum

Not working or a student.

Alex A.

18:16

Gotcha.

Optimizer

^

Alex A.

Well PPCG is kind of like a job.

Except you don't get paid for it.

:o

no...

Optimizer

shh. forget I said anything...

Alex A.

>.>

Optimizer

<.<

Alex A.

18:18

v.v

Optimizer

^.^

/./

Alex A.

\.\

feersum

⊗.⊗

Optimizer

feeling dizzy?

Alex A.

☉.☉

New Main Posts

18:34

0

Q: Avast, ye scallywags!

Blackbeard was an English pirate of the early 18th century. Although he was known for looting and taking ships, he commanded his vessels with the permission of their crews. There are no accounts of him ever harming or murdering his captives. This challenge is in honor of the infamous Blackbeard ...

code-golf

Doorknob

Am I the only one who finds it extremely amusing that "quantifier" in Polish is "kwantyfikator"?

feersum

I'll rewrite my pattern matching language source in Polish now so I can say that.

Optimizer

"analyzer" is "analitikator"?

Alex A.

translate pl: quantifier

(from French) oszacowania

uh

Doorknob

... what?

translate pl: this is English you silly bot. Quantifier

(from English) to jest Polski ci bot głupie. Kwantyfikator

Alex A.

18:39

translate: kwantyfikator

(from Polish) the quantifier

Oh, the quantifier.

One quantifier to rule them all.

feersum

I'm pretty sure Polski is not the correct translation of English...

Alex A.

Hahaha

I didn't catch that

translate pl: polski

(from Polish) polski

Oops

translate pl: English

(from English) Angielski

translate: Polski

(from Polish) Polish

Doorknob

uhhh

Alex A.

I blame Bing.

Optimizer

translate fr: English

Alex A.

18:43

translate: Bing sucks

(from English) Bing sucks

translate fr: English

(from English) Anglais

Optimizer

my bot is on an oil break?

Alex A.

Mods only, bro.

I still don't understand why we have this ability.

Doorknob

Mostly to figure out whether posts in a different language are spam or not.

feersum

Are posts in a different language otherwise allowed?

Alex A.

Ohhhh good point

Optimizer

18:45

ISTHISSPAM?CANYOUFIGURETHATOUTUSINGTRANSLATOR?

Alex A.

@feersum Por quoi non?

Doorknob

@feersum No, but generally nuking an innocent user's account as spam is a Bad Idea™.

feersum

I've never seen one.

Alex A.

An innocent user?

Optimizer

SE is langist?

Alex A.

18:55

They're linguists.

Martin Büttner

@AlexA. I meant that it seems like it got a massive surge of attention/upvotes over the last 24 hours, but maybe I'm also remembering it wrong.

Alex A.

Oh, okay. Idk.

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