Top #collatz 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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futureperfect

function u(t) {

c.width=1920;r=Math.floor(t*60);for(b=1;b<110;b++){a=r;i=0;while(a>1){x.fillText(a,i*9,b*9);if(a%2===1){a=3*a+1;}else{a=a/2;}i+=1.5;}r++}

Dec 27 2017 5:55 AM UTC

}// 137/140

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A little midnight Collatz for you all

u/taupelink

#collatz

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taupelink

function u(t) {

f=X=>{throw X};v=t|0
v?(s+=v+" ",v-1?u(v%2?3*v+1:v/2):(r=s,s="",f(r))):(s="",u(1))

Jul 19 2019 5:07 AM UTC

}// 82/140

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#collatz #recursive #recursion using u(t)

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Undefined

function u(t) {

l=n=>{a=[];while(n!=1){n%2==0?n=n/2:n=n*3+1;a.push(n)};return a}
throw (~~t+2)+': '+l(~~t+2)

Jan 4 2019 11:35 PM UTC

}// 92/140

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Mini #collatz

u/Undefined

Now starts instantly #math #maths
u/DataMeta

Neat

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hamptonio

function u(t) {

w=c.width=128;for(i=2;i<w*w;i++){s=i;for(k=0;s>1;k++){s=s%2?3*s+1:s/2};x.fillStyle=`hsl(${k*.9},80%,${k/3}%)`;x.fillRect(i%w,i/w|0,1,1);}

Mar 1 2017 9:38 PM UTC

}// 137/140

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Visualization of Collatz sequences: https://en.wikipedia.org/wiki/Collatz_conjec…

u/taupelink

#collatz
u/taupelink

Dwitter engine may have been updated since this dweet was posted...you can add "if(!t)" at the beginning although that bumps it up past 140 characters...
u/taupelink

#collatz

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taupelink

function u(t) {

f=(N,o)=>N-1?f(N%2?3*N+1:N/2,o+1):o;for(i=1e3;i--;x.fillRect(z%1920,z/1920|0,1,1))z=Math.random()*3e6|0,x.fillStyle=`hsl(${f(z,0)},99%,50%)`

May 10 2020 11:42 PM UTC

}// 140/140

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A #collatz step count visualization. The hue at (X,Y) is the steps needed for X+1920*Y to reach 1, or rather it's that step count modulo 360.

u/taupelink

See also d/1711, although that one clears the screen every time (change to Dwitter engine?)
u/pavel

Setting canvas width clears the screen
u/taupelink

Yup...dunno whether it was that way back in 2017
u/taupelink

I mean, just to be clear, d/1711 sets the canvas width every time. That causes the screen to clear. I'm not sure why d/1711 was coded that way...I'm speculating that one possibility is, when it was coded, the Dwitter engine didn't clear the screen when you set the width. Not something I'm all that curious about, to be honest. Carry on! :)

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taupelink

remix of d/11655 by u/Undefined

function u(t) {

l=(n,a)=>(a.push(n),n-1?l(n%2?n*3+1:n/2,a):a)
c.width|=0,k=0,b=l(~~t+2,[]),m=(Math.max(...b)/99)|1
b.forEach(X=>x.fillRect(k++*20,0,20,X/m))

Jun 7 2019 2:21 AM UTC

}// 140/140

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Mini #collatz, adapted for column graphs #math

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