C# (CSharp) Accord.Math.Decompositions QrDecomposition.Inverse Examples

Inverse() public method

Least squares solution of A * X = I

public Inverse ( ) : ].double[
return	].double[

Example #1

File: QrDecompositionTest.cs Project: accord-net/framework

        public void InverseTestNaN()
        {
            int n = 5;

            var I = Matrix.Identity(n);

            for (int i = 0; i < n; i++)
            {
                for (int j = 0; j < n; j++)
                {
                    double[,] value = Matrix.Magic(n);

                    value[i, j] = double.NaN;

                    var target = new QrDecomposition(value);
                    var solution = target.Solve(I);
                    var inverse = target.Inverse();

                    Assert.IsTrue(Matrix.IsEqual(solution, inverse));
                }
            }
        }

Example #2

File: QrDecompositionTest.cs Project: KommuSoft/accord_framework

        public void InverseTest()
        {
            double[,] value =
            {
               {  2, -1,  0 },
               { -1,  2, -1 },
               {  0, -1,  2 }
            };

            double[,] expected =
            {
                { 0.7500,    0.5000,    0.2500},
                { 0.5000,    1.0000,    0.5000},
                { 0.2500,    0.5000,    0.7500},
            };


            QrDecomposition target = new QrDecomposition(value);

            double[,] actual = target.Inverse();
            Assert.IsTrue(Matrix.IsEqual(expected, actual, 0.0000000000001));

            target = new QrDecomposition(value.Transpose(), true);
            actual = target.Inverse();
            Assert.IsTrue(Matrix.IsEqual(expected, actual, 0.0000000000001));
        }