code: public static void setRandomB(BMatrixRMaj mat , Random rand )
      {
          boolean d[] = mat.data;
          int size = mat.getNumElements();
  
  
          for( int i = 0; i < size; i++ ) {
              d[i] = rand.nextBoolean();
          }
      }
docs: <p>
  Sets each element in the boolean matrix to true or false with equal probability
  </p>
  
  @param mat The matrix who is to be randomized. Modified.
  @param rand Random number generator used to fill the matrix.