sub method

Mat33 sub(
  1. Mat33 a, [
  2. Mat33? b
])

Subtract a from this matrix

Implementation

Mat33 sub(Mat33  a, [Mat33? b ]) {
  if( b != null ) return subMatrixs( a, b );
  List<double> e = elements, te = a.elements;
  e[0] -= te[0]; e[1] -= te[1]; e[2] -= te[2];
  e[3] -= te[3]; e[4] -= te[4]; e[5] -= te[5];
  e[6] -= te[6]; e[7] -= te[7]; e[8] -= te[8];
  return this;
}