public function testMultiply(array $A, array $B, array $R)
{
$A = MatrixFactory::create($A);
$B = MatrixFactory::create($B);
$R = MatrixFactory::create($R);
$R2 = $A->multiply($B);
$this->assertInstanceOf('MathPHP\\LinearAlgebra\\Matrix', $R2);
$this->assertEquals($R, $R2);
}