Scilab Function

prbs_a - pseudo random binary sequences generation

### Calling Sequence

  `[u]=prbs_a(n,nc,[ids])`

### Description

generation of pseudo random binary sequences `u=[u0,u1,...,u_(n-1)];` u takes values in {-1,1} and changes at most nc times its sign. ids can be used to fix the date at which u must change its sign ids is then an integer vector with values in `[1:n]`.

### Examples

    u=prbs_a(50,10);
    plot2d2("onn",(1:50)',u',1,"151",' ',[0,-1.5,50,1.5]);