public void CofactorMatrix3()
{
Matrix3 m1 = new Matrix3(3, 5, 0,
2, -1, -7,
6, -1, 5);
float result = m1.Cofactor(0, 0);
float answer = -12;
Assert.Equal(answer, result);
float result02 = m1.Cofactor(1, 0);
float answer02 = -25;
Assert.Equal(answer02, result02);
}
public void Determinant_ShouldReturnExpectedValue()
{
// arrange
var sut = new Matrix3(new[, ] {
{ 1f, 2f, 6f }, { -5f, 8f, -4f }, { 2f, 6f, 4f }
});
// act
var cofactor00 = sut.Cofactor(0, 0);
var cofactor01 = sut.Cofactor(0, 1);
var cofactor02 = sut.Cofactor(0, 2);
var determinant = sut.Determinant();
// assert
using var _ = new AssertionScope();
cofactor00.Should().Be(56f);
cofactor01.Should().Be(12f);
cofactor02.Should().Be(-46f);
determinant.Should().Be(-196f);
}
public void Cofactor_ShouldReturnExpectedValue(
int row,
int column,
float expectedMinor,
float expectedCofactor
)
{
// arrange
var sut = new Matrix3(new[, ] {
{ 3f, 5f, 0f }, { 2f, -1f, -7f }, { 6f, -1f, 5f }
});
// act
var actualMinor = sut.Minor(row, column);
var actualCofactor = sut.Cofactor(row, column);
// assert
using var _ = new AssertionScope();
actualMinor.Should().Be(expectedMinor);
actualCofactor.Should().Be(expectedCofactor);
}