my second function does not seem to work. It is supposed to multiply each row of a 2D array by a 1D array. Im reading in a 2D and a 1D array from a file using I/O redirection <data1.txt > out1.txt. Can somebody point out the problem im doing. It does not print numbers.

Code:

#include<stdio.h>
#define SIZE 100
void calcSumAs(double a[][SIZE], double y[], int m, int n);
void calcSumAXs(double a[][SIZE], double y[], double rs[], int m, int n);
int main(void)
{
int m;
int n;
int i;
int j;
double ar[SIZE];
double prod[SIZE];
double mx[SIZE][SIZE];
double sum[SIZE];
double Y;
scanf("%d%d", &m, &n);
for (i = 0; i < m; i++)
{
for (j = 0; j < n; j++)
scanf("%lf", &mx[i][j]);
}
for (i = 0; i < m; i++)
scanf("%lf", &ar[i]);
calcSumAs(mx, sum, m, n);
calcSumAXs(mx, ar, prod, m, n);
for (i = 0; i < m; i++)
printf("%lf ", prod[i]);
return 0;
}
void calcSumAs(double a[][SIZE], double y[], int m, int n)
{
int i, j;
for (i = 0; i < m; i++)
for (y[i] = 0, j = 0; j < n; j++)
y[i] += a[i][j];
return;
}
void calcSumAXs(double a[][SIZE], double y[], double rs[], int m, int n)
{
int i, j;
for(i = 0; i < m; i++)
for(rs[i] = 0, j = 0; j < n; j++)
rs[i] += a[i][j] * y[j];
return;
}