C - De-interleave Data?

You might take a look at the qsort() library function There are two possiblities: 1 The float could be seen as a pointer to an array of float An array of float in fact is a pointer to a the first float in this array. That's where the pointer to pointer comes from 2 The float is an array of float will say an array pointers to float Referring case 1: Assuming your source data is held by an array referenced by source and you know how many entries this array has you could use qsort() to "de-interleave", say "sort", the data To do so you need to declare a function which could be used by qsort() to access and compare the data to sort The signature of this function expected by qsort is: int(*compar)(const void *, const void *) So you implementation of it might look like this: int compare_floats(const void * pvFloat1, const void * pvFloat2) { if ((!pvFloat1) && (!pvFloat2)) return 0; if (!pvFloat1) return -1; if (!pvFloat2) return 1; if (*((float*) pvFloat1) *((float*) pvFloat2)) return 1; /* The floats are equal here. */ return 0; } (the code above sorts NULL-entries to the beginning of the destination array) In your code make sure you have enough memory assigned to dest and call qsort() this way (assuming your source arrary holds eight entries): qsort(*source, *dest, 8, compare_floats) Referring case 2: (Later when I find some time ;-).

You might take a look at the qsort() library function. There are two possiblities: 1 The float ** could be seen as a pointer to an array of float. An array of float in fact is a pointer to a the first float in this array.

That's where the pointer to pointer comes from. 2 The float ** is an array of float *, will say an array pointers to float. Referring case 1: Assuming your source data is held by an array referenced by ** source and you know how many entries this array has you could use qsort() to "de-interleave", say "sort", the data.To do so you need to declare a function which could be used by qsort() to access and compare the data to sort.

The signature of this function expected by qsort is: int(*compar)(const void *, const void *) So you implementation of it might look like this: int compare_floats(const void * pvFloat1, const void * pvFloat2) { if ((!pvFloat1) && (!pvFloat2)) return 0; if (!pvFloat1) return -1; if (!pvFloat2) return 1; if (*((float*) pvFloat1) *((float*) pvFloat2)) return 1; /* The floats are equal here. */ return 0; } (the code above sorts NULL-entries to the beginning of the destination array) In your code make sure you have enough memory assigned to dest and call qsort() this way (assuming your source arrary holds eight entries): qsort(*source, *dest, 8, compare_floats); Referring case 2: (Later when I find some time ;-).

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