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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4.  
  5. float **allocate_mem_m(int m, int n)
  6. {
  7. int i;
  8.  float **arr = malloc(n*sizeof(*arr));
  9.  for(i=0;i<n;i++)
  10.    {
  11.      arr[i]=malloc(m*sizeof(**arr));
  12.    }
  13.  return arr;
  14. } 
  15.  
  16. void free_mem_m(int m, float **array) {
  17.   int i;
  18.   for (i = 0; i < m; i++) {
  19.     free(array[i]);
  20.   }
  21.   free(array);
  22. }
  23.  
  24. float **transpose(int m, int n, float Xy[]) {
  25.   int i,j;
  26.   float **result = allocate_mem_m(m,n);
  27.   for(i = 0; i < m; i++) {
  28.     for(j = 0; j < n; j++) {
  29.       result[i][j] = Xy[j*n+i];
  30.     }
  31.   }
  32.   return result;
  33. }
  34.  
  35. int main(void) {
  36.   float Xy[3][3] = { { 0, 1, 2 }, { 3, 4, 5 }, { 6, 7, 8 } };
  37.   float **transposed = transpose(3, 3, &Xy[0][0]);
  38.   int i, j;
  39.   for (i = 0; i < 3; i++)
  40.     for (j = 0; j < 3; j++)
  41.       printf("%f ", transposed[i][j]);
  42.   printf("\n");
  43.   free_mem_m(3, transposed);
  44.   return 0;
  45. }
  46.  
  47.  
Success #stdin #stdout 0s 2380KB
comments (?)
stdin 
Standard input is empty
stdout 
0.000000 3.000000 6.000000 1.000000 4.000000 7.000000 2.000000 5.000000 8.000000
https://ideone.com/CyNdpn
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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