Accord.Imaging.Filters.QuadTransformationCalcs.MultiplyMatrix C# (CSharp) Method

        private static double[,] MultiplyMatrix( double[,] a, double[,] b )
        {
            double[,] c = new double[3, 3];

            c[0, 0] = a[0, 0] * b[0, 0] + a[0, 1] * b[1, 0] + a[0, 2] * b[2, 0];
            c[0, 1] = a[0, 0] * b[0, 1] + a[0, 1] * b[1, 1] + a[0, 2] * b[2, 1];
            c[0, 2] = a[0, 0] * b[0, 2] + a[0, 1] * b[1, 2] + a[0, 2] * b[2, 2];
            c[1, 0] = a[1, 0] * b[0, 0] + a[1, 1] * b[1, 0] + a[1, 2] * b[2, 0];
            c[1, 1] = a[1, 0] * b[0, 1] + a[1, 1] * b[1, 1] + a[1, 2] * b[2, 1];
            c[1, 2] = a[1, 0] * b[0, 2] + a[1, 1] * b[1, 2] + a[1, 2] * b[2, 2];
            c[2, 0] = a[2, 0] * b[0, 0] + a[2, 1] * b[1, 0] + a[2, 2] * b[2, 0];
            c[2, 1] = a[2, 0] * b[0, 1] + a[2, 1] * b[1, 1] + a[2, 2] * b[2, 1];
            c[2, 2] = a[2, 0] * b[0, 2] + a[2, 1] * b[1, 2] + a[2, 2] * b[2, 2];

            return c;
        }