public void GetRow_ReturnsCorrectRow(int index)
{
// Arrange
var vectors = new Vector4f[4];
vectors[index] = new Vector4f(1, 2, 3, 4);
var mat = new Matrix4f(vectors[0], vectors[1], vectors[2], vectors[3]);
// Act
var theRow = mat.Row(index);
// Assert
Assert.That(theRow, Is.EqualTo(new Vector4f(1, 2, 3, 4)));
}
public Matrix4f Multiply(Matrix4f rhs)
{
Contract.Requires(rhs != null, "rhs cannot be null.");
Contract.EndContractBlock();
if (rhs == null)
throw new ArgumentNullException("rhs");
var result = new float[4, 4];
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
result[j, i] = System.Numerics.VectorMath.DotProduct(Column(j), rhs.Row(i));
}
}
return new Matrix4f(
new Vector4f(result[0, 0], result[1, 0], result[2, 0], result[3, 0]),
new Vector4f(result[0, 1], result[1, 1], result[2, 1], result[3, 1]),
new Vector4f(result[0, 2], result[1, 2], result[2, 2], result[3, 2]),
new Vector4f(result[0, 3], result[1, 3], result[2, 3], result[3, 3]));
}
