The Nineteenth Byte

quartata

2:00 AM

f-f*(n%2)*2 is probably pretty good then.

I can't think of anything better really. Simplicity is bliss.

Sp3000

Golfwise (1|n%-2)*f is shorter

it's not bad

(just a side note)

goo.gl/zqbSdI

@Sp3000 I think he's not doing something golfy

@orlp wus dis

orlp

2:00 AM

6 instructions

Sp3000

I know, I'm just saying as an aside :/

orlp

but you can also do it in 4

goo.gl/4tssV9

the top bit in an IEEE754 double is the sign bit

quartata

@orlp holy shit wat is this ahhhh

bitwise operators they burn

OK but seriously that's cool. Is it faster though?

TanMath

Am I a whiner?

Sparr

@orlp manipulating float/double sign bits is non-portable

orlp

2:02 AM

so by XOR'ing that bit with the last bit of the int (which says whether it's odd or not) flips it

quartata

Self-esteem

In sociology and psychology, self-esteem reflects a person's overall subjective emotional evaluation of his or her own worth. It is a judgment of oneself as well as an attitude toward the self. Self-esteem encompasses beliefs (for example, "I am competent", "I am worthy") and emotions such as triumph, despair, pride, and shame. Smith and Mackie (2007) defined it by saying "The self-concept is what we think about the self; self-esteem, is the positive or negative evaluations of the self, as in how we feel about it." Self-esteem is attractive as a social psychological construct because researchers...

orlp

@Sparr I explicitly mentioned IEEE754 double

TanMath

@quartata huh?

orlp

the only thing that proper code would use is an union rather than pointer aliasing

@quartata quite a bit

it only uses 4 instructions

quartata

@TanMath You keep criticizing and questioning yourself. Don't do that.

orlp

2:04 AM

and those instructions are simple (mov, sal, xor)

quartata

You're hurting your self-esteem

Be happy not sad

Sparr

@orlp sure, you said that, but the code doesn't say that

quartata

You're not doing anything wrong; you're very inquisitive which is not a bad thing at all

TanMath

@quartata Mego said I am a whiner.. That is why I am asking...

orlp

@Sparr it's an assumption

quartata

2:05 AM

@TanMath He doesn't know you don't take it at face value

orlp

@quartata I actually use this trick in my fast sine code

quartata

@orlp Interesting...

orlp

gist.github.com/orlp/1501b5faa56b592683d5

I range reduce to [-pi, pi]

TanMath

@quartata do I act like a whiner?

orlp

but [pi, 2pi] has opposite sign from [-pi, pi]

quartata

2:06 AM

@orlp Ah, so that's where you use the negate trick.

orlp

which is incidently when the period is odd

quartata

That's neato

@TanMath I don't think so, but what do I know?

Don't take what I say at any more face value then what anyone else on the Internet says about you

TanMath

@quartata well I want to improve my behavior

orlp

rule #1: only take advice from those you respect

rule #2: respect (almost) no one

if you're wondering whether you should be listening to someone, the answer is probably no

quartata

What he means is that if you have to ask yourself whether Mego is a reliable source that means he probably isn't

Geobits

2:10 AM

Except me. Always listen to me.

quartata

@Geobits This is true.

This works because Geobits is more of a concept than a physical being.

Geobits

Transcendence is wonderful.

El'endia Starman

@TanMath 1) Don't say anything that could possibly be interpreted as an insult unless you A) really mean it, or B) make it really clear that it's in jest. 2) Regarding the answer you were trying to write in Seriously, I think the main issue was that it seemed like you were trying to get other people to fix your answer for you or to teach you Seriously without putting any work in. Just like SO: "what have you tried?"

TanMath

Mego calls me such stuff.. I am thinking whether or not he is correct

@quartata no, he is am evil AI, along with his sock!

Geobits

TanMath calls me such stuff.. I am thinking whether or not he is correct.

quartata

2:18 AM

Anyone here use Linux Mint?

Dennis

Briefly...

TanMath

@Geobits it is a joke! Do you Seriously take jokes literally?

(Bad pun)

Geobits

How is a poor evil AI supposed to recognize a joke?

quartata

Do you know if it has a listing of recently-launched programs built into the start menu thing like Ubuntu does?

Doorknob

@quartata why?

Dennis

2:19 AM

@quartata Which of the gazillion DE's do you use?

TanMath

@Geobits so, you come you would have self-esteem? You are a bot!

quartata

@Dennis I'm not currently using Linux Mint; I'm trying to answer a semi-related question on Unix SE

Dennis

Still, same question.

Geobits

@TanMath Bots have feelings, too. Stop being a bigot :P

quartata

I assume he's using Mate since that's the one that comes with it

Dennis

2:20 AM

The default for Mint is Cinnamon AFAIK.

quartata

@Dennis It is?

Since when?

Huh.

TanMath

@El'endiaStarman but I have written code... That is what I tried...

orlp

xubuntu is best

xfce rocks

Dennis

@quartata Well, there are no real defaults, but Cinnamon is made by the Mint people.

orlp

just does what you want

El'endia Starman

2:21 AM

@TanMath How many Seriously answers have you written? (Ones that worked, anyway.)

Doorknob

oh, do we get to have DE wars now also? :P

TanMath

@El'endiaStarman 0

Zgarb

@quartata I installed Mint over 2 years ago, and Cinnamon was the default then.

Dennis

@orlp Xfce is quite good, but I had too many problems with Ubuntu. If Xfce had a "present desktop" effect, I'd consider switching.

Geobits

Unity for life >_>

Doorknob

2:22 AM

@Geobits ಠ_ಠ

Geobits

:D

Dennis

^

orlp

@Dennis could you rephrase the last part

El'endia Starman

@TanMath So, then, start small. Add two numbers. Do factorial without a built-in. Add up (or multiply) all numbers in the input. That sort of thing. Get familiar with the basics of the language before you try to do gamma, which is fairly difficult.

TanMath

@El'endiaStarman OK.. But I would rather use it for something, not write up some code for no use

Geobits

2:25 AM

Project Euler?

Doorknob

@TanMath learning is a use

orlp

@Dennis ?

Dennis

@Dennis @orlp How I prefer to switch windows.

El'endia Starman

@Geobits Excellent idea! That's how I learned Python, @TanMath.

orlp

what do you mean with 'present desktop'?

Dennis

2:26 AM

@orlp Scale all open windows on that virtual desktop, so that you can click on one to select it.

Geobits

That seems like it could be a simple add-on instead of dependent on the DE. Doesn't Compiz have something like that?

orlp

ah

quartata

@Dennis I really like this too.

Doorknob

I've always had the opinion that it's useful in theory to have something like that, and it seems nice, but in practice requires too much use of the mouse :P

(also, psshhh, giving away sekrit chatroom names)

Geobits

Yea, I usually use keyboard for switching, to be honest.

El'endia Starman

2:28 AM

@Doorknob Win+Tab in Windows 10. :D

Well, that's for the desktop switch view. Alt+Tab does the same for the current desktop.

Dennis

I've configured my computer so that it is the only way of switching windows. I have a dedicated mouse button on my home computer, and a four-finger gesture on my laptop.

Geobits

Good lord, a four-finger gesture? That's dedication.

Doorknob

Alt+hjkl ftw. :P

Dennis

@Geobits Just a swipe-up. The dedication is that I wrote the gesture suite myself. The only "real" code I've ever written.

Geobits

Aww, and here I was hoping it was some kind of secret jutsu move.

Dennis

2:31 AM

Circular scrolling works nicely too.

orlp

by the way

the window selection thing is what you get in xfce if you hold alt-tab

with thumbnails and clickable

Doorknob

pro tip: don't write cron jobs that have errors in them

orlp

I can't screenshot because apparently you can't screenshot while alt-tabbing

Doorknob

llama@llama:~$ mail
Mail version 8.1.2 01/15/2001.  Type ? for help.
"/var/mail/llama": 8 messages 8 new
>N  1 root@llama.locald  Tue Nov 17 18:17   26/1036  Cron <root@llama>    cd / && run-parts --report /etc/cron.hourly
 N  2 root@llama.locald  Tue Nov 17 19:17   26/1036  Cron <root@llama>    cd / && run-parts --report /etc/cron.hourly
 N  3 root@llama.locald  Tue Nov 17 20:17   26/1036  Cron <root@llama>    cd / && run-parts --report /etc/cron.hourly
 N  4 root@llama.locald  Tue Nov 17 21:17   26/1036  Cron <root@llama>    cd / && run-parts --report /etc/cron.hourly

Geobits

^ @mods spam alert

Doorknob

2:33 AM

@Geobits I'm on it. Will suspend the offending user.

Dennis

@Geobits Yes, Compiz calls it Scale. It used to have some issues when I was using Ubuntu (some years ago) with windows that were minimized and/or on other virtual desktops

Llamas have roots?

Doorknob

Llamas have families too!

TanMath

Why doesn't heroku for Seriously not work on mobile? @Mego

Geobits

@Dennis Oh, yea, scale sucked last I tried (which was some time ago). I normally don't have much open in each desktop/monitor, though, so I usually do switching between those instead. The up/down/left/right helps me find things easier since they're laid out in space, not just "whatever order I've been using things in".

Like, my browser is always on top-left desktop, left monitor, etc.

TanMath

BTW what did you think about my flag France answer?

Geobits

2:36 AM

And basically nothing gets minimized ever.

TheDoctor

@Doorknob cronjobs always mail you

Dennis

@Geobits I used GNOME Classic + Compiz on Ubuntu. I rarely minimized anything, but when I did, boy was I sorry. After using Scale to bring a minimized window to the front, it became click-through! Using the keyboard worked normally, but any mouse clicks affected only the window below it...

orlp

this chat room should be renamed

"The Nineteenth Mod"

Geobits

@Dennis Nice. Yea, I didn't use scale long. I don't remember exactly what issues I had with it, but I remember it being a pain in the ass on multiple fronts.

El'endia Starman

@orlp ...why? Only half of the users talking now are mods...

orlp

2:39 AM

@El'endiaStarman "only half"

El'endia Starman

>_>

Geobits

El'endia's only a fake mod here, though.

El'endia Starman

ಠ_ಠ

Doorknob

@orlp I know several rooms that have a much higher blue density :P

(Including some that are not actually mod-only.)

Geobits

Go figure, some people that hang out in chat and are generally active end up mods.

I think it's stranger to see sites with no/little mod presence in chat, tbh.

Calvin's Hobbies

2:42 AM

@El'endiaStarman @Optimizer @undergroundmonorail I got the mouseover rainbow distance thing working here! However it's pretty slow so I wouldn't try it on images larger than 200x200.

^ images I've been testing with

TheDoctor

@Doorknob like charcoal HQ, that place is an ocean

El'endia Starman

Okay, serious question: at what point does a square number become too large to reliably square-root and get an integer which can be squared to give the original number? (In most languages, not using any libraries.)

Geobits

2?

Doorknob

irb(main):011:0> Math.sqrt(2)**2
=> 2.0000000000000004

oh

orlp

@El'endiaStarman integers?

or floating point?

El'endia Starman

2:44 AM

Yeah, left out that important detail... :P

orlp

or

I mean, what data types are we talking here

El'endia Starman

Like, if you're doing a**2+b**2 = c**2 and you want to know if a**2+b**2 is a square.

Doorknob

in Ruby, at least, never

TheDoctor

hey remember this:

Doorknob

because Ruby uses bignum

orlp

2:45 AM

bin it bin it bin it bin it bin it bin it bin it bin it bin it bin it bin it bin it bin it bin it bin it bin it

Doorknob

I'd imagine that this would just be limited by the precision of your language's number type

El'endia Starman

I know there are better ways, but assuming the naive way...

Doorknob

@TheDoctor annoying flashing gif is annoying

orlp

so

let me get this straight

Geobits

Times like this I wish I'd grabbed Rainbolt's image hider script.

orlp

2:45 AM

you have an integer square

you want to do IEEE754 floating point pow(x, 0.5) on it

cast that to an integer

and square that integer

El'endia Starman

yup

At what point can I not be sure that I'll get it right?

Anonymous

@TanMath It doesn't? I've never tried.

El'endia Starman

(Assume rounding, not necessarily int.)

Anonymous

@TheDoctor Animator vs Animation?

El'endia Starman

@Mego That's not that.

Though those videos are awesome.

Anonymous

2:47 AM

@El'endiaStarman Looked similar

Anonymous

Hella awesome

Anonymous

@El'endiaStarman I can write a script and run it if you want

TanMath

@Mego yeah.

orlp

@El'endiaStarman anything below 2^53 should be fine

above that the integers are no longer dense inside float

TanMath

It says "Application Error"

0

A: Draw the national flag of France

Python, 223 209 bytes Thanks @Sp3000 from turtle import* def D():fill(1);fd(100);rt(90);fd(200);rt(90);fd(100);rt(90);fd(200);rt(90);fill(0) lt(180) fillcolor("#0055a4") D() fillcolor("white") goto(100,0) D() fillcolor("#ef4135") goto(200,0) D() Try it here

More golfed! @Sp3000

El'endia Starman

2:48 AM

@Mego Sure. It's for my "Pythagoras' Other Leg" Sandbox challenge.

Anonymous

Waiting for a mathematica builtin answer — Faraz Masroor 45 mins ago

Anonymous

Do people not read?

orlp

>>> 2.0**53 - (2.0**53 - 1)
1.0
>>> (2.0**53 + 1) - 2.0**53
0.0

Anonymous

> No built-ins or libraries/modules that provide a mapping from states to capitals or capitals to states, or lists of capitals and/or states (for example, Mathematica's CityData built-in)

orlp

2^53 + 1 is the first integer that can not be represented as a floating point (IEEE754 double)

Geobits

2:50 AM

I think that's a very fair limit for triangle side length :P

Anonymous

Actually it's 2

orlp

actually

I was a bit too generous there

it seems I have already done this research in the past

@El'endiaStarman github.com/orlp/libop/blob/master/bits/math.h#L224

Anonymous

int(pow(2,0.5))**2 returns 1

TanMath

Maybe we should have a American flag challenge as well...

orlp

@Mego since when is 2 a square

Anonymous

2:51 AM

@orlp Since I said so shut up

Geobits

You were ninja'd with the 2 joke anyway, by a long shot :P

Anonymous

;_;

El'endia Starman

@Geobits It's actually for the hypotenuse.

Anonymous

2 is a square, it's just not a perfect square

Anonymous

#leave2alone

Anonymous

2:53 AM

#irrationallivesmatter

El'endia Starman

Also, 2**53 is not a perfect square.

Doorknob

the definition of a "square number" is that its square root has to be an integer :P

Anonymous

@Doorknob that be the definition of a perfect square

orlp

@El'endiaStarman the function I linked

can accurately compute the integer part of the square root for any 64 bit integer

Geobits

@El'endiaStarman Yea, that's why I edited to 'side length' instead of input. Still, it's fairly generous. That means the legs would just have to be limited accordingly.

Sp3000

2:54 AM

@TanMath Nice :) I think you can drop the lt(180) as well, actually

Also we've had an... ASCII American Flag?

El'endia Starman

>>> import math
>>> int(math.sqrt(2**52))
67108864
>>> 67108864**2
4503599627370496
>>> 2**52
4503599627370496
>>> int(math.sqrt(2**54))
134217728
>>> 134217728**2
18014398509481984
>>> 2**54
18014398509481984

Anonymous

@quartata Thanks for pointing out that builtins are banned to that guy, his inability to read made me too stunned to reply

Calvin's Hobbies

@Mego Your opening sentence...too many two letter runs O.o

orlp

@El'endiaStarman yes, above the limit I quoted there are more numbers that work

but not all

Geobits

People's inability (or unwillingness) to read shouldn't be shocking to any but the newest members ;)

Doorknob

2:56 AM

or to anyone but people who are new to the internet, really :P

Anonymous

@Calvin'sHobbies I say not enough

Geobits

Or new to humanity, to tell the truth.

New Main Posts

0

Q: Shortened words

My cell phone carrier charges a cent per character in a text! I need a program to shorten the words for me, while still being understandable. I will be texting this program to my friends, so it needs to be as short as possible. Your program will take a String from STDIN reduce any consecutive le...

code-golf

El'endia Starman

@orlp True. I think I'll just say that the hypotenuse is no longer than the language's limit. (Without using libraries, etc.) And that in practice, expect inputs no bigger than 100,000.

@Calvin'sHobbies That's pretty awesome. :D

Also, I added the -30% bonus with outline.

Calvin's Hobbies

@Mego It is if it is.

orlp

2:59 AM

@Calvin'sHobbies I can't get it to work

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