New #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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Current theme challenge: #Opposites

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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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rodrigo.siqueira

function u(t) {

v=(a,b,Φ,r)=>{for(i=0;i++<r*2;)
x.fillRect(
a-=S(Φ*3),
b-=C(Φ*i*r/5)*3,s=r/59,s)
r>9&&v(a,b,S(b),r*=.9)}
t<6&&v(960,800,t,99)

Apr 12 2023 8:34 PM UTC

}// 125/140

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Electric circuit diagram - Advanced Generative Fourier Inductive-Reactance Alternate Current with labels (sketch version) #math #fourier

u/tomxor

Inductor, half a capacitor, ac source, resistor, resistor, resistor.. so many resistors! :P
u/joeytwiddle

Is this a RISC-V? https://www.inverse.com/science/riscv-comput…
u/cantelope

wow. i feel it would be improved with a stopping point -> image
u/jdspugh

Cool

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donbright

function u(t) {

w=(c.width=999)/2
for(i=-t;i<t;i+=.1)for(j=-t;j<t;j+=.1){
B=1+i*i+j*j
X=S(t)*i/B
Y=j/B
Z=(B-2)/B/2
x.fillRect(w+(X+Y+Z)*w,w+(Y-Z-X)*w,2,2)}

Nov 8 2021 6:45 AM UTC

}// 139/140

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stereographic projection of the plane (in this case, a 0.1 grid to infinity) onto the sphere. aka Moebius Transformation. see also https://hyrodium.tumblr.com/post/13708635481… and https://en.wikipedia.org/wiki/Stereographic_…

u/donbright

#math #stereographic

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donbright

remix of d/23884 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 6:11 PM UTC

}// 126/140

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Prime fun 3 / 3 - when X is less than Y, then X modulo Y gives X, so we see the normal vertical prime stripes, white shows X is a prime. not sure about the rest, there seems to be a large white line around the line where X equals Y, #math #primes

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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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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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katkip

function u(t) {

s="this🎉is🎉the🎉smallest🎉hex🎉hashing🎉algorithm🎉ever🎉"
throw[...s].reverse``.map(z=a=>a.charCodeAt(0)**3).reduce(t=(a,b)=>a+b).toString`16`

Jul 3 2020 3:53 PM UTC

}// 137/140

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u/pavel

reverse? t=?
u/katkip

#hash #math
u/katkip

you are right, they are useless

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katkip

function u(t) {

eval(unescape(escape`𭁼𯀨𮠽𙰧𛁯🐱𚐬𬰽𘠯𚠴𝀴𝀴𝀫𛐥𧠦割𞱧👱🐾𮱷🐧𙰻𭱨𪑬𩐨𭰮𬱰𫁩𭁠𝁠𛡬𩑮𩱴𪀼𝐩𭰫👳𦰨𣑡𭁨𛡲𨑮𩁯𫐨𚐪𜐴𚑼𜁝𞱲𩑴𭑲𫠠𭱽𞱦𫱲𚁩🐹𞐹𞱩𛐭𞰩𮱴𬡹𮱴👠𙁻𬠽𩑶𨑬𚁱👧𚀩𚑽𘀽𘀤𮱱𯑠𞱯🐽𬠿𮠫🐨𫰫𚰬𭀫𙱜𫠧𚐺𜁽𨱡𭁣𪁻𯑽𭁨𬡯𭰠𮠠`.replace(/uD./g,'')))

Jun 2 2020 4:00 PM UTC

}// 140/140

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Sorting the four fours numbers! #waitforit #math #puzzle. This is an automatic program that will throw the list of natural numbers written as javascript expressions that eval that number! To view the code, replace eval with throw

u/katkip

example print: 1 = 44/44 2 = 4/4+4/+4 3 = 4+~44%4 4 = ~44%~4^4 5 = 44%4-~4 6 = 44/4+~4 7 = 44/4-4 8 = 4+4//-/^*4^*4 9 = 4/4+4+4
u/KilledByAPixel

nice!
u/katkip

looks like it gets stuck at 17
u/katkip

17 = 4^4*4-~4 18 = 4-~4+4-~4 19 = ~-4^~-4*4+4 20 = 4&4^4*4 21 = 4/4-~4*4
u/katkip

nvm. stuck at 22

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katkip

function u(t) {

f=x=>S(x)*C(x/2)*3
d=(q,t)=>(q(t+1/1e9)-q(t))*1e9

x.fillRect(t?t*100:0,t?540-f(t)*100:540,t?9:2e3,9)
x.fillRect(t*100,540-d(f,t)*100,5,5)

Feb 22 2020 4:59 PM UTC

}// 138/140

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derivative calculator! d(function, location) will calculate the derivative at function(location)! #math

dwitter.net | #Math