Oscillate value with some randomness

[Dan Ebberts]

I’m not sure if this is what you’re asking for, but this is my best guess:

seedRandom(index,true);
ampMin = random(0,20);
ampMax = random(20,80);
freq = random(2,3);

offset = (ampMax + ampMin)/2;
mult = (ampMax – ampMin)/2;
mult*Math.sin(freq*time*Math.PI*2) + offset

Dan

[Roger Maus]

I am sorry that I forgot to mention that I need som ongoing randomness. I’d like the values to change every period.

I hope this quick sketch makes it clear:

[Roger Maus]

I still couldn’t find a solution, I still need your help. Could I make myself clear? Could anyone please point the way which I could give a try?

[Dan Ebberts]

This is as close as I could get:


seedRandom(index,true);

t = inPoint;
while (t <= time){
t0 = t;
period = random(2,3);
t += period;
}
if (time >= inPoint){
seedRandom(t0,true);
amp = random(40,50);
50 + amp*Math.sin((time - t0)*Math.PI*2/period)
}else
value


Dan

[Jacob Giacometti]

Thank you Dan, I just found your expression after 20 minutes of google, and used it, it’s exactly what I needed! Nice dude

BEST EXPRESSION I EVER SEEN IN MY LIFE