sum method

double sum()

Returns element wise sum of the vector.

Vector v = Vector([1.0, -1.0, 1.0]);
print(v.sum());

will print 1.0

Implementation

double sum() {
  double v = 0.0;
  for (int i = 0; i < elements; i++) {
    v += this[i];
  }
  return v;
}