public void When_Calculating_Determinant_Of_Matrix_Double_With_Result_Is_Returned()
{
//Arrange
Matrix4 matrixOne = new Matrix4(1.0, 2.0, 0.0, 3.0, 3.0, 2.0, 1.0, 2.0, 1.0, 0.0, 1.0, 1.0, 2.0, 1.0, 3.0, 3.0);
//Act
double result = matrixOne.Determinant();
//Assert
Assert.AreEqual(9.0, result);
}
public Matrix4 Inverse()
{
Matrix4 matrixOne = new Matrix4(xx, xy, xz, xw, yx, yy, yz, yw, zx, zy, zz, zw, wx, wy, wz, ww);
Matrix4 adjOne = matrixOne.Adjoint();
double detOne = matrixOne.Determinant();
return new Matrix4( adjOne.xx / detOne, adjOne.xy / detOne, adjOne.xz / detOne, adjOne.xw / detOne,
adjOne.yx / detOne, adjOne.yy / detOne, adjOne.yz / detOne, adjOne.yw / detOne,
adjOne.zx / detOne, adjOne.zy / detOne, adjOne.zz / detOne, adjOne.zw / detOne,
adjOne.wx / detOne, adjOne.wy / detOne, adjOne.wz / detOne, adjOne.ww / detOne);
}