Thread: Convolution in c

well, my professor said that we are not supposed to ask for any inputs to store in the array, everything starts at 0 and goes up from there. I have some code but it gives me 0 all the time as the value for the convolution

Code:

#include<stdio.h>


void mult( int f[], int g[], int n){ //function to multiply  first array by 4

        int i;
        for (i =0; i < n; i++){
                g[i] = 4 * f[i];    //multiply f[i] by 4 so the series is sampled every four

        }
}


void convo(int f[], int g[], int  h[], int n){  /*function to convolve the 2 arrays*/

        int i, j;

        for(i = 0; i < n; i++){
            h[i] = 0;
            for(j = 0; j < n; j++){
                 if (g[j]-f[i]>0){
                       h[i] += g[j] * f[j-i];  /*convolve the two arrays*/
                              }

                          }
                        printf("index: %d\t convolution %d\n", i, h[i]);  //display the index number starting from 0 and its convolution value

                }
}



int main()
{
        int n = 0;

        printf("enter the number of elements in the array: ");
        scanf("%d", &n);
        int f[1000];
        int g[100];

        int h[n];

        mult(f, g, n);          //call mult function
        convo(f, g, h, n);      //call convo function

        return 0;

}

Garbage * 4 still equal Garbage.

Bye, You are not learning anything from me; So, I give up on trying to help you.

Tim S.