public void Multiplication()
{
double s = 0.1234;
Matrix22D m = new Matrix22D(columnMajor, MatrixOrder.ColumnMajor);
m = Matrix22D.Multiply(s, m);
for (int i = 0; i < 4; i++)
{
Assert.AreEqual(rowMajor[i] * s, m[i]);
}
}
public void MultiplyVector()
{
Vector2D v = new Vector2D(2.34, 3.45);
Assert.AreEqual(v, Matrix22D.Multiply(Matrix22D.Identity, v));
Assert.AreEqual(Vector2D.Zero, Matrix22D.Multiply(Matrix22D.Zero, v));
Matrix22D m = new Matrix22D(12, 23, 45, 67);
Assert.IsTrue(Vector2D.AreNumericallyEqual(v, Matrix22D.Multiply(m * m.Inverse, v)));
for (int i = 0; i < 2; i++)
{
Assert.AreEqual(Vector2D.Dot(m.GetRow(i), v), Matrix22D.Multiply(m, v)[i]);
}
}
public void MultiplyMatrix()
{
Matrix22D m = new Matrix22D(12, 23, 45, 67);
Assert.AreEqual(Matrix22D.Zero, Matrix22D.Multiply(m, Matrix22D.Zero));
Assert.AreEqual(Matrix22D.Zero, Matrix22D.Multiply(Matrix22D.Zero, m));
Assert.AreEqual(m, Matrix22D.Multiply(m, Matrix22D.Identity));
Assert.AreEqual(m, Matrix22D.Multiply(Matrix22D.Identity, m));
Assert.IsTrue(Matrix22D.AreNumericallyEqual(Matrix22D.Identity, Matrix22D.Multiply(m, m.Inverse)));
Assert.IsTrue(Matrix22D.AreNumericallyEqual(Matrix22D.Identity, Matrix22D.Multiply(m.Inverse, m)));
Matrix22D m1 = new Matrix22D(columnMajor, MatrixOrder.ColumnMajor);
Matrix22D m2 = new Matrix22D(12, 23, 45, 67);
Matrix22D result = Matrix22D.Multiply(m1, m2);
for (int column = 0; column < 2; column++)
{
for (int row = 0; row < 2; row++)
{
Assert.AreEqual(Vector2D.Dot(m1.GetRow(row), m2.GetColumn(column)), result[row, column]);
}
}
}
