Top #fourier 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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jaemiejaemie

function u(t) {

c.width=640;x.beginPath();for(i=0;i<640;i++){a=180;for(j=1;j<t*60%60;j+=~~(t)%2+1){a+=S((i+t*60)*j/20)*50/j}x.lineTo(i,a)}x.stroke()

Dec 27 2017 10:31 AM UTC

}// 132/140

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demonstration of basic fourier curves (square/saw)

Show more comments…
u/sigveseb

Very cool!
u/joeytwiddle

Nice. DSP hero!
u/iverjo

Kudos!
u/RomanW

Excellent!
u/joeytwiddle

#math
u/katkip

#fourier

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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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joe.m

function u(t) {

w=1920
f=12.57/w
t?0:y=[]
j=t*120+1
for(i=0;i<w;i++)
{
if(!t)y[i]=0
y[i]+=S(i*f*j)/j
x.fillRect(i, 520+400*y[i], 1, 1);
}

Sep 27 2019 2:59 PM UTC

}// 121/140

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ooh, you can keep state!

u/tomxor

#fourier
u/tomxor

Welcome to Dwitter! you can also use u instead of y to save the initialisation space, as you can use functions for their object properties.

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MingusDew

function u(t) {

c.width*=1;nn=27*S(t*2);for(i=960;i--;){p=0;for(n=1;n<nn;n+=2)p+=S(n*i*0.00657)/n;x.lineTo(10+2*i,540-480*p);}x.lineWidth=5;x.stroke();

Jan 21 2019 6:17 AM UTC

}// 135/140

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u/joeytwiddle

#math #fourier
u/katkip

Nice

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katkip

function u(t) {

s=200;x.fillRect(t*90,540+S(t)*s+S(t*2)*s/2+S(t*3)*s/3+S(t*4)*s/4+S(t*5)*s/5+S(t*6)*s/6+S(t*7)*s/7+S(t*8)*s/8+S(t*9)*s/9+S(t*10)*s/10,10,20)

Feb 6 2019 10:28 AM UTC

}// 140/140

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#fourier transform

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katkip

function u(t) {

f=(x,n=t)=>n>0?f(S(x*2),n-1):x
for(i=960;i--;)x.fillRect(i*2,540-f(i/99)*500,2,2)

Aug 26 2020 7:10 PM UTC

}// 81/140

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#fourier

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katkip

function u(t) {

f=(n,r)=>r?f(S(n)*(t<5?2:t/5-1),--r):S(n)
t||(z=0)
for(j=19;j--;)for(i=69;i--;)x.fillRect(z*100,540-f(z,j)*300,2,2),z+=1/1e5
throw f(z,8)

Dec 30 2019 12:14 PM UTC

}// 137/140

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a #fourier transform with increasting dimension is creating the bifurcation diagram? #waitforit #math

u/LydianLights

Whoa that's crazy

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joe.m

function u(t) {

w=1920
c.width=w
f=6.28/w
for(i=0;i<w;i++)
{y=0
for(j=1;j<=Math.abs(((20*t)%40)-20);j+=2) y+=S(i*f*j)/j
x.fillRect(i, 520+520*y, 10, 10);}

Sep 27 2019 1:09 PM UTC

}// 138/140

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sum of even harmonics

u/tomxor

#fourier

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Georges-Abitbol

remix of d/18353 by u/Georges-Abitbol

function u(t) {

c.width=1920
for(i=0;i<959;i++)
{b=S(i*0.006545);for(j=3;j<25*(1+C(t))*(1-C(t));j+=2)
b+=S(i*0.006545*j)/j;x.fillRect(2*i,540+b*300,9,9,0)}

Apr 20 2020 6:43 PM UTC

}// 139/140

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u/katkip

#fourier

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