sum of columns in a 2 dimensional array

Question

static double [][] initialArray = {{7.432, 8.541, 23.398, 3.981}, {721.859, 6.9211, 29.7505, 53.6483}, {87.901, 455.72, 91.567, 57.988}};

public double[] columnSum(         


        

Answer 1

Problem with your code is when it tries to fetch arr[3].length as there does not exist simple solution like sum = sum+arr[i][j] where i refers to row and j refers to column.

int row = arr.length;
int col = arr[0].length;
for(int j = 0; j < cols; j++)
{
            int sum = 0;
            for(int i = 0; i < rows; i++)
            {
                sum = sum + input[i][j];
            }

        }