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TWEET # Untitled a guest Oct 23rd, 2019 67 Never
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1. using System;
2.
3. namespace ConsoleApplication41
4. {
5.     class Program
6.     {
7.         static void Main()
8.         {
9.
10.             double[,] matrix =
11.             {
12.                 {1, 2, 3},
13.                 {4, 10, 6},
14.                 {7, 8, 9}
15.             };
16.
17.             var det = DetRec(matrix);
18.             Console.WriteLine(det);
19.         }
20.
21.         private static double DetRec(double[,] matrix)
22.         {
23.             if (matrix.Length == 4)
24.             {
25.                 return matrix[0, 0] * matrix[1, 1] - matrix[0, 1] * matrix[1, 0];
26.             }
27.             double sign = 1, result = 0;
28.             for (int i = 0; i < matrix.GetLength(1); i++)
29.             {
30.                 double[,] minor = GetMinor(matrix, i);
31.                 result += sign * matrix[0, i] * DetRec(minor);
32.                 sign = -sign;
33.             }
34.             return result;
35.         }
36.
37.         private static double[,] GetMinor(double[,] matrix, int n)
38.         {
39.             double[,] result = new double[matrix.GetLength(0) - 1, matrix.GetLength(0) - 1];
40.             for (int i = 1; i < matrix.GetLength(0); i++)
41.             {
42.                 for (int j = 0; j < n; j++)
43.                     result[i - 1, j] = matrix[i, j];
44.                 for (int j = n + 1; j < matrix.GetLength(0); j++)
45.                     result[i - 1, j - 1] = matrix[i, j];
46.             }
47.             return result;
48.         }
49.     }
50. }
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