qsort: Sort 1 Dimension of 3D array in C

Question

I have a 3D array: float input[2][50][1000];

I want to quick sort it from:

qsort (x, sizeof(x)/sizeof(*x), sizeof(*x), comp);

where comp is

int comp (const void * elem1, const void * elem2) {
    float f = *((float*)elem1);
    float s = *((float*)elem2);
    if (f > s) return  1;
    if (f < s) return -1;
    return 0;
}

I just want to sort 1 dimension of my 3D array, i.e I want to sort input[0][temp][0], input[0][temp][1], input[0][temp][2] and so on.

Ques: What do I replace x with? Forgive me if it sounds stupid

Ultimately this is to sort 1000 elements from input[0][temp][0]..input[0][temp][999], is that correct ? — WhozCraig
– WhozCraig, Commented Apr 12, 2014 at 7:36
@WhozCraig That figure may not be equal to thousand but yah that dimension only. It may be less too like till 50. But how does that matter? — Daksh Shah
– Daksh Shah, Commented Apr 12, 2014 at 7:37
@WhozCraig Yah that should be float, could you please write an answer. And yah about the 1000 thing, i am declaring it till 1000 but maybe i fill elements upto 100 only and if so i will sort upto 100 only — Daksh Shah
– Daksh Shah, Commented Apr 12, 2014 at 7:39
Note: despite the name, qsort() may sort using a different algorithm than "quick sort". — pmg
– pmg, Commented Apr 12, 2014 at 7:59

BLUEPIXY · Accepted Answer · 2014-04-12 09:03:42Z

1

float (*x)[1000] = &input[0][temp];
qsort (x, sizeof(*x)/sizeof(**x), sizeof(**x), comp);

answered Apr 12, 2014 at 9:03

BLUEPIXY

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