func (d *Matrix) addSparse(other matrix.Matrix) matrix.Matrix {
sum := d.Copy()
for e := range other.IterItems() {
sum.Set(e.Row, e.Col, sum.Get(e.Row, e.Col)+e.Val)
}
return sum
}
// Add returns a new Matrix that is the sum of this Matrix and other.
func (d *Matrix) Add(other matrix.Matrix) matrix.Matrix {
if other.IsSparse() {
return d.addSparse(other)
}
dother := other.(*Matrix)
return d.addDense(dother)
}