how to rearrange structure element on the bases of positions given in other array?

[gevni]

I want to rearrange the positions of structure elements on the bases of perm_array.

 typedef struct gg{
  element d;
  int group;
} gg;
gg col_data[16];
int perm_array[4]={2,3,1,0};
int ptr = 9;
for (l=0; l<4; l++)
{
// i need some statement like that but this statement will re write the value of previous structure element
col_data[ptr+l]= col_data[ptr+perm_array[l]];
}

How can i rearrange structure element like {ptr+2,ptr+3,ptr+1,ptr+0} ?

[Click_here]

Stick to array notation.

Make two arrays of "gg" structures -> One in the original order (1,2,3,...) and the other the order given by perm_array.

Use a "for" loop to go through each perm_array element: Something like this

col_data[i] = original_data[perm_array[i]];

[gevni]

Thanks.. it work now

Stick to array notation.

Make two arrays of "gg" structures -> One in the original order (1,2,3,...) and the other the order given by perm_array.

Use a "for" loop to go through each perm_array element: Something like this

col_data[i] = original_data[perm_array[i]];