Question

How to sum 2D array (matrix) cols in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            int[,] matrix = new int[3, 5] { { 1, 2, 3, 4, 5 },
                                            { 1, 2, 3, 4, 5 },
                                            { 1, 2, 3, 4, 5 } };
            int[] cols_sum = new int[5] { 0, 0, 0, 0, 0 };

            sum_matrix_cols(matrix, cols_sum);

            for (int i = 0; i < 5; i++)
                Console.WriteLine(cols_sum[i]);
        }

        public static void sum_matrix_cols(int[,] matrix, int[] cols_sum)
        {
            for (int j = 0; j < matrix.GetLength(1); j++)
            {
                for (int i = 0; i < matrix.GetLength(0); i++)
                    cols_sum[j] += matrix[i,j];
            }
        }
    }
}


/*
run:
       
3
6
9
12
15
   
*/

 

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