Memcpy and two-dimensial arrays

Asked Oct 16 '15 at 14:17

Active Oct 16 '15 at 14:20

Viewed 95 times

What I am trying to do is to copy a part of matrix to an other in order to create a submatrix. However, while the following part of code looks quiet logical to me, it results in absolutely nothing being copied into a destination.

void Copy(double **mt, int sx, int ex, int sy, int ey, double **res)
{
int i;
int t = sizeof(double)*(ey-sy+1);
for(i = 0; i < ex-sx+1; i++)
    memcpy(&mt[i][0],&res[sx+i][sy], t);
return;
}

edited Oct 16 '15 at 14:20

asked Oct 16 '15 at 14:17

RKT

The no 2D array, actually not even a 1D array or array of pointers. – too honest for this site Oct 16 '15 at 14:19
`&mt[i][0]` and `&res[sx+i][sy]` should lead to compile error since `mt[i]` and `res[sx+i]` are neither array nor pointer. – MikeCAT Oct 16 '15 at 14:20
Pardon me, that was my typo. It is actually supposed to be a two-dimensial array. – RKT Oct 16 '15 at 14:21
1

Your code [copied something](http://melpon.org/wandbox/permlink/vt761OFZc8d8PsoZ). Please provide [MCVE](http://stackoverflow.com/help/mcve). – MikeCAT Oct 16 '15 at 14:25

Memcpy and two-dimensial arrays

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