mirror of
git://projects.qi-hardware.com/cae-tools.git
synced 2024-12-23 08:39:33 +02:00
53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
|
/*
|
||
|
|
* histo.c - Distribution of Z values
|
||
|
|
*
|
||
|
|
* Written 2010 by Werner Almesberger
|
||
|
|
* Copyright 2010 by Werner Almesberger
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#include "util.h"
|
||
|
|
#include "array.h"
|
||
|
|
#include "histo.h"
|
||
|
|
|
||
|
|
|
||
|
|
struct histo *make_histo(struct array *a)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
struct histo *h;
|
||
|
|
|
||
|
|
h = alloc_type(struct histo);
|
||
|
|
h->n = a->max_z-a->min_z+1;
|
||
|
|
h->b = alloc_size(h->n*sizeof(int));
|
||
|
|
for (i = 0; i != h->n; i++)
|
||
|
|
h->b[i] = 0;
|
||
|
|
for (i = 0; i != (a->max_x-a->min_x+1)*(a->max_y-a->min_y+1); i++)
|
||
|
|
if (a->data[i] != UNDEF)
|
||
|
|
h->b[a->data[i]-a->min_z]++;
|
||
|
|
return h;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void free_histo(struct histo *h)
|
||
|
|
{
|
||
|
|
free(h);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
int median(const struct histo *h)
|
||
|
|
{
|
||
|
|
int tot = 0, sum = 0;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
for (i = 0; i != h->n; i++)
|
||
|
|
tot += h->b[i];
|
||
|
|
for (i = 0; sum < tot/2; i++)
|
||
|
|
sum += h->b[i];
|
||
|
|
return i-1;
|
||
|
|
}
|