}
else {
// random vector of length = variance
r = new AlgVector(model, random);
}
r.changeLength(Math.pow(variance, 0.5));
PFD(D_RANDOMVECTOR, "random vector *variance "+ r);
// add random vector to center
AlgVector c = new AlgVector(center);
AlgVector c2 = (AlgVector) c.clone();