add method
Implementation
Matrix add(Matrix x) {
if (m != x.m || n != x.n) {
//todo: implement error handling
}
Matrix result = Matrix(m, n);
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
result.set(i, j, entries[i][j].add(x.entries[i][j]));
}
}
return result;
}