Coding Challenge #96: Visualizing the Digits of Pi

[@Naej7]

One Coding Train video a day, keeps the depression away

[@AkshayAradhya]

Naej Choo-Chooo

[@benciccarelli9870]

Oui oui señor

[@Naej7]

Big Bang Ben Sí sí sir

[@noosetime9423]

it should crash in 4 hours and 37 minutes (if it's 60fps), because you're accessing i+1, and i+1 is gonna be 1 000 000, when the array goes only from 0 to 999 999

[@TheCodingTrain]

oops!

[@ConorDrew]

I noticed this when he wrote it, only because during one of my assignments indexOutofBounds caused me so many headaches as it’s a hidden gem of an error

[@chitrachandrakar272]

@@TheCodingTrain whoops*

[@timecubed]

​@@ConorDrew what did the assignment need you to do?

[@ConorDrew]

@@timecubed it was 6 years ago, so I don’t really know, but a good takeaway from this is, things like this get learnt very quick once they catch you out, the best way to learn to program is by making and fixing mistakes, understanding the error message, calling your self an idiot as you done the same thing last week, and fix it.

[@fabiomarques4110]

how to draw the moon in a very strange way!

[@wiscatbijles]

Just sick how much it resembles it.

[@VenturiLife]

*Mun

[@Scouarn]

mün

[@xemoable]

*Maan

[@ilyazakharov5862]

*Луна

[@batfan1939]

You should assign each line a hue, and have the saturation go up by one each time that number appears. So, the circle would start off white, then become more colorful the longer the algorithm ran.

[@leonardgrellier8790]

You're simply on the top of my 'most creative teachers' list, along with 3Blue1Brown

[@Jabrils]

that last piece was mesmerizing

[@leontius5502]

@Will Mathias Nice joke

[@quinxx12]

Dude your hoodie is amazing! It's like the rainbow colors on the cords run right into the main body where the colors get mashed together and result in gray.

[@rasyidcode3142]

my new favorite channel for now.

[@alexi1182]

Me? The viewer? A more talented creative person than you are? REALLY DAN?!! I've been trying to do this in p5 for the last 4 hours in which I accomplished absolutely nothing :)

[@TheCodingTrain]

you can do it, I believe in you!

[@alexi1182]

I hope so my friend...

[@elliey.x]

Yay! Finally! Thank you so much for this, you're a huge help to my beginning of learning code!

[@TheCodingTrain]

Glad to hear!

[@RicoBrassers]

As a hint: You don't have to split a string into a string array to get each character. Just iterate through each char in the string. Or, more suitable for the draw()-method, you could just use the charAt(int) method of a string object, to get the char at the specified position. example: int digit = Character.getNumericValue(digits.charAt(i));

[@Naveication]

RicoBrassers getNumericValue(char c) is way slower than accessing the index of a predefined integer array. While it wouldn't make much difference in this example, if he wanted to visualize the first trillion digits of pi and to speed up the process calculate a million on every drawcall then your approach would take a significantly longer amount of time. To parse a character in to an integer a million times per frame is just way slower than simply accessing a million integers from an array

[@illustriouschin]

Looks like the webs my pet spider makes after he's had too much meth.

[@xetop]

15:38 Hahahaa I was just about to comment, that you made a pi based moon :D Nice video as always Mr Processing God !

[@jasonwalker4610]

This is in response to the rand pi calc using square circle method. You would get a more accurate pi calculation if you just made a nested x,y for loop, counted the amount that has rad less this x/2 from center of x,y then calculated ratio after nest is complete.

[@Budzique]

Added this just above line() for some random colors: stroke(255/10*(digit+1), 255/10*(nextDigit+1), 255/10*(digits[index+2]+1)); which will use the current, next and 3rd digits to create a random RGB.

[@coding3070]

I kind of want to print it out as a poster

[@Xnoob545]

15:19 looks like the moon

[@ManosChalvatzopoulos]

someone saw numberphile videos!

[@AkshayAradhya]

Manos Chalvatzopoulos Its just pi day related

[@grev7794]

PBJANDHIGHFIVES math concepts arent supposed to be short or meaningful :) i do learn about combinatorics, encryption, decryption,... from that channel.

[@sigmareaver680]

yeah that legit looks like a moon.... idk.... jupiter or saturn

[@JinTsen]

Shouldn't it be random in between -diff/2 and diff/2, so the digits won't overlap?

[@AkshayAradhya]

JinTsen Yes.

[@TheCodingTrain]

thanks for the correction! (the visualization here is ultimately meaningless, but hopefully it is helpful and can inspire viewers to make meaningful ones!)

[@inperangua]

JinTsen I'd even make a range a bit smaller, so the digits have visible space between them.

[@inperangua]

It's finally done Moon = Pi

[@tobiass.8496]

Moon == Pi

[@gautamsingh9175]

this video is mind blowing but until now i am not good in coding so when i gain some knowledge then i can try it own my own you are great.

[@TheCodingTrain]

Thank you!

[@juangreen8194]

Is a proven fact that the digits of pi are randomly distributed, so visualizing the digits of pi is equivalent to visualizing a randomly generated string of numbers.

[@purrsum]

15:25 for some reason it reminds me alot of the moon, right there.

[@datejer]

These artists are polish lol, dont worry about mispronounceing their names, polish names are hard to pronounce if youre not polish, and no one i saw on the internet could pronounce polish words right, im polish too lol

[@datejer]

Accualy only tge first one is polish lol

[@bittim]

15:20 It somehow looks like the moon

[@0xDEAD_Inside]

If you squint your eyes to see the moon, you will see a smily.

[@nemesmatyas]

We are cookin' here!

[@cassandradawn780]

11:42 noice

[@bryanmcconnahea9873]

Can anyone explain to me why the map function defining the angles use 10 instead of 9? It does in fact produce a uniformity of points around the circle by using 10 where using 9 pairs two points but in uniform manner in relation to other pairs... if that makes any sense. Anywya, I thought the map function was to convert the possible range of 0-9 to their equivalent of the range of 0 - 2pi...

[@Truueh]

You should marry Felicity Smoak from "The Green Arrow".

[@vishalmishra1937]

which technologies are used in this video to make visualization

[@hermessantos181]

The moon is PI :)

[@codeman1021]

Sir pls start Neuro evolution 🙏🙏

[@GOAFPilotChannel]

you should make the stroke weight proportional to the count

[@TheCodingTrain]

Nice idea!

[@qwertzuiopqwertzuiop2107]

I respect the effort you out intk making this videos and of course when making a video every single day not every single one of them will reach the bar, that you set quite high wuth your other videos. Buti was expecting you visualizing the patterns hidden in pi, as pi isnt a random number. But the results you got would have been the same if youve had used random numbers. At least as far i cant tell.. if not please correct me. Keep up the good work, most of your videos are great!

[@TheCodingTrain]

yes, this is right. this post offers more info: www.askamathematician.com/2009/11/since-pi-is-infinite-can-i-draw-any-random-number-sequence-and-be-certain-that-it-exists-somewhere-in-the-digits-of-pi/

[@muhammadsaqlainishtiaq4467]

Why processing if P5 is there or P5 if Processing is there. Do everything in 1.

[@jakob7281]

Hello fellow programmers! int randomInt = (int)random(10); That line of code stores a random integer between 0 and 10 in randomInt. But here comes my question: Is every outcome equally likely? Because if typecasting to int is the same as it is in some other languages, wouldnt 10 be very unlikely? Sorry for asking here, didnt know where else to put it. Thanks in advance, Jakob

[@portalsrule1239]

I think it should be equally likely. If you wanted to test it, you could keep track of how many times each digit got picked.

[@sadhlife]

just run a code to count how many times each digit came up out of 10,000 total random draws and check how far each is from 1000

[@jakob7281]

So, turns out the last number is not likely at all... As i expected, you can assume the chance of it occuring is 0: 0: 111098824 1: 111085682 2: 111127480 3: 111127772 4: 111120418 5: 111117453 6: 111122554 7: 111103272 8: 111096545 9: 0

[@Schnorzel1337]

I dont know what you did but random(10) gives the range [0,9] or for integers [0,10). Here is why:. random() gives a number between 0 inclusive and 1 exclusive. The function random(n) is equal to random() * n. So the range is [0,n). Tested it in Processing and Java.

[@sadhlife]

Schnorzel1337 yeah.

[@AbdulAziz-lf9lg]

Journey to the Moon with PI....😂

[@empiricistsacademy7181]

Recently found your channel and am a new subscriber. I want to make interactive educational web apps for teaching statistic concepts (for example to illustrate central limit theorem), which of your playlist series do you think would be relevant?

[@TheCodingTrain]

If you are totally new to programming try this one! kzbin.infoplaylists?view=50&shelf_id=14&sort=dd

[@empiricistsacademy7181]

Thank you very much for the reply, good think I clicked the bell icon. I am familiar with python programming for data analysis and implementing ML algorithms. But I don't know anything about web development, I heard django and flask in python can make web apps as well, so I was wondering whether I should learn that in python or java script. I will check out your java script playlist, thanks.

[@JinTsen]

painful to be up to date with your videos, now I can only watch whenever you realease one ^^'

[@gronkhfan011]

JinTsen

[@arwa9385]

you r the cutest old man i've ever seen

[@thederpyminecrafter77]

what text editor are you using

[@GenesisRussell-jt2rp]

what does PI sound like if smaller integers are lower pitched and larger integers are higher pitched

[@GenesisRussell-jt2rp]

on second thought it probably sounds like white noise

[@kniscior]

By the way surname od this guy krzywinski is polish, u pronounce it like kshyvinsky

[@meikusje]

Do you think you could write a code to simulate the movements of a flock of starlings?

[@aggressivegeek]

I think he has a video (series?) on PSO, a Swarm Intelligence algorithm based on patterns such as a flock of birds. Might be a bit more abstract from what you're asking for but certainly worth a look.

[@waterfallbw]

11:42 *420!!!!!*

[@septicsounds3216]

Shouldn't the map-function for the angles only go from 0 to 9? (instead of 10)

[@farhansyabibi170]

Die Chaoten that would make 0 at 0, and 9 at two_pi, which is basically the same

[@SelmanIsHere]

The point is counted as a digit???

[@Bloodwyn1756Swagger]

You could at least used a byte array ;)

[@alanesamuel5167]

Hi Dan Which Laptop do u use?

[@danielsotojaimes3602]

alane samuel .

[@svanse45.56]

Does he use Java?

[@frogdeity]

NONAGON INFINITY 12:56

[@samtheman448]

Just saw them live about a week ago... amazing experience.

[@frogdeity]

They're coming to philly in June. I've never seen them live before and I am so hype.

[@samtheman448]

Well you have much to look forward to! My personal fav from the gig was greenhouse heat death but it was all mindblowing.

[@prabhjotsingh1255]

51 viewer i watched it live

[@theking23457]

200 liker

[@MsTwte]

what language i s this?

[@TheCodingTrain]

Java with Processing: processing.org

[@nietschecrossout550]

101 Likes!

[@LoganDark4357]

TAU

[@Rightlime7923]

Coding train is million times better than numberphile ----

[@Zakiyfarhanfuad]

When i look at the clickbait, i thought it was a moon image

[@razeev4685]

#first :)

[@patricks5997]

Is it the regular java language?

[@TheCodingTrain]

Yes it is! (But using Processing: processing.org)

[@patricks5997]

Thx man ! : )