Weighted random VEX

weightedrandom.vex

int i, steps = 80;
float sumhist[], sum=0, slice = 1.0/float(steps);
seed += 123456789;

for (i=0;i<steps;i++) {
    float pos = (i*slice);
    float val = chramp("__rndweight", pos);
    sum += val;    
    push(sumhist, sum);
}
float rnd = random(seed) * sum;

// linear search
for(i=0;i<steps-1;i++) {
    if (rnd > sumhist[i] && rnd <= sumhist[i+1])
        break;
}
weight_random = float(i)/float(steps) + random(seed+123)*slice;