code: @Override
      public double[] get(double[] target) {
          if ((target == null) || (target.length != 16)) {
              target = new double[16];
          }
          target[0] = m00;
          target[1] = m01;
          target[2] = m02;
          target[3] = m03;
  
          target[4] = m10;
          target[5] = m11;
          target[6] = m12;
          target[7] = m13;
  
          target[8] = m20;
          target[9] = m21;
          target[10] = m22;
          target[11] = m23;
  
          target[12] = m30;
          target[13] = m31;
          target[14] = m32;
          target[15] = m33;
  
          return target;
      }
docs: Copies the matrix contents into a 16 entry double array.
  If target is null (or not the correct size), a new array will be created.