func (m *matrixImpl) Subtract(n types.Matrix) types.Matrix {
validates.ShapeShouldBeSame(m, n)
cursor := n.NonZeros()
for cursor.HasNext() {
element, row, column := cursor.Get()
m.Update(row, column, m.Get(row, column)-element)
}
return m
}
func (m *matrixImpl) Equal(n types.Matrix) bool {
validates.ShapeShouldBeSame(m, n)
cursor := n.All()
for cursor.HasNext() {
element, row, column := cursor.Get()
if m.Get(row, column) != element {
return false
}
}
return true
}
func (m *matrixImpl) Multiply(n types.Matrix) types.Matrix {
validates.ShapeShouldBeMultipliable(m, n)
rows := m.Rows()
columns := n.Columns()
r := Zeros(rows, columns)
cursor := n.NonZeros()
for cursor.HasNext() {
element, j, k := cursor.Get()
for i := 0; i < rows; i++ {
r.Update(i, k, r.Get(i, k)+m.Get(i, j)*element)
}
}
return r
}