Accord.Tests.Math.MatrixTest.SolveTest4 C# (CSharp) Method

        public void SolveTest4()
        {
            // Test with more rows than columns
            {
                double[,] matrix = 
                {
                    { 1, 2 },
                    { 3, 4 },
                    { 5, 6 },
                };

                double[,] rightSide =
                {
                    { 7 },
                    { 8 },
                    { 9 },
                };

                Assert.IsTrue(matrix.GetLength(0) > matrix.GetLength(1));

                double[,] expected = 
                {
                    { -6   },
                    {  6.5 }
                };

                double[,] actual = Matrix.Solve(matrix, rightSide);

                Assert.IsTrue(expected.IsEqual(actual, 1e-10));
            }

            // test with more columns than rows
            {
                double[,] matrix = 
                {
                    { 1, 2, 3 },
                    { 4, 5, 6 },
                };

                double[,] rightSide = 
                {
                    { 7 },
                    { 8 }
                };

                Assert.IsTrue(matrix.GetLength(0) < matrix.GetLength(1));


                double[,] expected = 
                {
                   { -55 / 18.0 }, 
                   {  1  /  9.0 },
                   {  59 / 18.0 },
                };

                double[,] actual = Matrix.Solve(matrix, rightSide);

                Assert.IsTrue(expected.IsEqual(actual, 1e-10));
            }
        }