Top #math dweets

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

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donbright

remix of d/1871 by u/walsh9

function u(t) {

圈=(n,d,N,D)=>{d+D<15?(圈(n,d,n+N,d+D),圈(n+N,d+D,N,D),w=2e3,m=d+D,x.beginPath(),r=w/m/m/2,x.arc(w*(n+N)/m,r,r,0,7),x.fill()):1}
圈(0,1,1,1)

Mar 7 2017 11:35 PM UTC

}// 136/140

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basic Ford's Circles (sort of like Apollonian Circle Packing but every circle touches the floor, or here, the ceiling)

u/donbright

#math
u/donbright

see also https://www.dwitter.net/d/15086 by @taupelink
u/donbright

#numbertheory
u/taupelink

nice!

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donbright

remix of d/23883 by u/donbright

function u(t) {

質=(n)=>{for(j=2;j<n;j++){if (n%j==0)return n}return 0}
格=7
for(X=299;X--;)
for(Y=299;Y--;)
if (質(X^Y)) x.fillRect(格*X,格*Y,格,格)

Sep 19 2021 5:48 PM UTC

}// 126/140

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Prime fun 2 / 3 - Normally X binary XOR with Y produces a single white line, but if we only draw black when X XOR Y is a prime number, then we get a pattern. #math #primes

u/donbright

(note i have flipped black/white in my caption, actually its drawing black when the number is not prime)
u/rep_movsd

Fascinating
u/Joachim

#circuit

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taupelink

function u(t) {

g=(X,Y,n,s)=>{if(Y==0)s=X;else{r=X%Y;s=X+'='+Math.floor(X/Y)+'*'+Y+'+'+r;g(Y,r,n+1)}x.fillText(s,0,n*90)}
x.font=`5em"`;g(12345,6789,1)

May 30 2019 2:19 AM UTC

}// 136/140

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Euclidean algorithm #math #recursive #recursion (my first dweet!)

u/Xen

nice work!!!

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rodrigo.siqueira

remix of d/12434 by u/katkip

function u(t) {

t||(a=b=0)
for(i=2e3;i--;)x.fillRect(960+b*C(a),540+b*S(a),1,1),a+=1.8*C(2.6*a)+C(t/4+.009),b+=.002

Feb 20 2019 9:24 PM UTC

}// 99/140

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The Flower of Bifurcation #bifurcation

u/katkip

this is #cute #math

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lewdev

function u(t) {

eval(unescape(escape`景爨挮睩摴栽㌲〬倽繾⡴⼲⤥㌬椽㈴Ⱳ㵮㴾䵡瑨⹡扳⡓⡱⨪温⨸簰⤻焽⠸⭾繴㸾㌩⩩ⴭ㬩砮晩汬呥硴⡠⑻椫ㅽ⸠⑻爨倩素⑻∫⴪⼢子嵽․筲⡐⬲⥽‽ 彠ⰹ⬨繾⡩⼸⤪㤹⤬ㄵ⬨椪㈰┱㘰⤩`.replace(/u([^D].)/g,'$1%')))

Oct 9 2023 1:11 AM UTC

}// 133/140

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✍ #Math #HomeworkGenerator (another app I made, which is my most popular app)

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KilledByAPixel

function u(t) {

Z=x=>(((x%=360)<0?x+=360:x)<180?4:-4)*(x=(x%=180)*(180-x))/(40500-x)
for(i=w=2e3;i--;)x.fillRect(i,t?600+Z(i)*99:400+S(i/57.3)*99,1,t?w:-w)

Jun 12 2023 10:54 PM UTC

}// 139/140

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Bhaskara I's Sine Approximation - Z(x) approximates sine with x in degrees

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donbright

function u(t) {

質=(n)=>{for(j=2;j<n;j++){if (n%j==0)return n}return 0}
格=7
for(X=299;X--;)
for(Y=299;Y--;)
if (質(X&Y)) x.fillRect(格*X,格*Y,格,格)

Sep 19 2021 5:40 PM UTC

}// 128/140

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Prime fun 1 / 3 - This is the standard X&Y (binary AND) Sierpinski triangle picture but only where X & Y is a prime number. perhaps revealing a relationship between primes and binary AND #math #primes

u/donbright

(note white = X&Y is prime, black = X&Y is composite)
u/andrea270872

this is really nice. retro and mathsy at the same time!
u/donbright

#Sierpinski

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mildlybean

function u(t) {

for(r=X=c.width+=0;X-=2;t?T[X]>r?[T[X-1],T[X]]=[T[X],r]:0:T[X]=Math.random()*999)x.fillStyle=`hsl(${r/4},99%,45%`,x.fillRect(X,0,1,r=T[X++])

Dec 20 2019 12:38 AM UTC

}// 140/140

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Bubble Sort

u/Odog8

duuuude
u/pavel

#sort has a few others
u/katkip

awesome #math
u/katkip

#visualization #graph

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donbright

remix of d/14804 by u/taupelink

function u(t) {

c.width=400
for(i=N=t>>33<<32;i>0;i--)
for(k=90;k--;){U=200+k*S(t+i)
V=99+k*C(t+i)
N%i?0:k>80?(x.fillText(i,U,V),k=80):x.fillRect(U,V,2,2)}

Jun 28 2019 11:57 PM UTC

}// 139/140

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prime o'clock in the morning

u/donbright

thanks to @taupelink for inspiration
u/taupelink

yay!
u/joeytwiddle

Fascinating! #primes #math U=200+k*S(a=i/1.91),V=99-k*C(a)

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katkip

function u(t) {

t||(a=b=1);for(i=999;i--;)a+=S(b-S(b)),b+=C(a-C(a-C(a*C(t)))),x.fillRect(b*300+900,a*600-400,4,4),x.globalAlpha=.2

Feb 14 2019 6:38 PM UTC

}// 114/140

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Crown of #math

dwitter.net | #math