public function testMultiply() { $column = new ColumnVector(25, 5, 1); $column2 = $column->multiply(ColumnVector::initialize(3, 2.56)); $this->assertInstanceOf(ColumnVector::class, $column2); $this->assertSame([25.0, 5.0, 1.0], $column->toArray()); $this->assertSame([64.0, 12.8, 2.56], $column2->toArray()); }