multiplication static method

Matrix multiplication(Matrix a, Matrix b)

Return matrix multiplication of a and b

Throw an exception if dimension's condition not met

Implementation

static Matrix multiplication(Matrix a, Matrix b) {
  if (a.m == b.n) {
    var resultMatrix = Matrix.zero(n: a.n, m: b.m);
    for (int i = 0; i < resultMatrix.n; i += 1) {
      for (int j = 0; j < resultMatrix.m; j += 1) {
        double sum = 0;
        for (int k = 0; k < a.m; k += 1) {
          sum += a[i][k] * b[k][j];
        }
        resultMatrix[i][j] = sum;
      }
    }
    return resultMatrix;
  } else {
    throw Exception('Dimensions error: A.m != B.n  |${a.m}) != ${b.n}|');
  }
}