code: public static void randomVector( DMatrixRMaj cov ,
                                       DMatrixRMaj vector ,
                                       Random rand  )
      {
          CovarianceRandomDraw_DDRM rng = new CovarianceRandomDraw_DDRM(rand,cov);
          rng.next(vector);
      }
docs: Sets vector to a random value based upon a zero-mean multivariate Gaussian distribution with
  covariance 'cov'.  If repeat calls are made to this class, consider using {@link CovarianceRandomDraw_DDRM} instead.
  
  @param cov The distirbutions covariance.  Not modified.
  @param vector The random vector. Modified.
  @param rand Random number generator.