Random value hold 1 or -1

[papsphilip]

Trying to find a little trick to return random selection of two specific values (1 or -1) and hold it for a number of frames or i in a loop

so it would be 1,1,1,-1,-1,-1,1,1,1,-1,-1,-1

or even better random ranges 1,1,1,-1,-1,-1,1,1,1,1,-1,-1,-1,-1,1,1,-1,-1

something like this but with better control of the distribution

for(int i=0; i<10; i++)
{
    float test = fit(floor(fit01(rand(i),-1,1)),-1,0,-1,1);
    int np = addpoint(0, pos);
    setpointattrib(0, "test", np, test, "set");
{

 

[Fenolis]

For the case with same sub-sequence run length (run in Detail wrangle):

int seqLen = 30;
int subSeqLen = 2;
int offset = 0;
i[]@seq;

for (int i = 0; i < seqLen; i++){
 //this value is constant for the length of the sub sequence
 int seed = floor(i / subSeqLen);
 
 //rand returns 0-1 float
 //rint returns 0 or 1
 //math turns 0/1 to -1/1
 int value = (rint(rand(seed + offset)) * 2) - 1;
 
 push(@seq, value);
}

For the case with random run length:

int seqLen = 30;
int minRunLen = 2;
int maxRunLen = 10;
int runLenArr[];
int valueArr[];
int seed1 = 123;
int seed2 = 456;
i[]@seq;

//generate a smaller array to hold run lengths
//maximum length of this array is seqLen / minRunLen
for (int i = 0; i < seqLen / minRunLen; i++){
  int value = floor(fit(rand(i + seed1), 0, 1, minRunLen, maxRunLen));
  push(runLenArr, value);
}

//for each value in the run length array
for (int j = 0; j < len(runLenArr); j++){
  //generate that number of random numbers and add these values to valueArr
  for (int k = 0; k < runLenArr[j]; k++){
    int value = (rint(rand(runLenArr[j] + seed2)) * 2) - 1;
    push(valueArr, value);
  }
}

//finally, copy the desired values into the target array
for (int m = 0; m < seqLen; m++){
  push(@seq, valueArr[m]);
}

There may be a better way to do this, but this is the thought process I used.

Edited April 25, 2022 by Fenolis

[papsphilip]

thank you very much for the detailed response! will study these asap