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xmax.c
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#include <stdlib.h>
#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/calc.h>
/****************************************************************
max(x0,x1,...,xn) returns maximum value
****************************************************************/
int f_max(int argc, const int *argt, void **args)
{
int i, j;
if (argc < 1)
return E_ARG_LO;
for (i = 1; i <= argc; i++)
if (argt[i] != argt[0])
return E_ARG_TYPE;
switch (argt[0]) {
case CELL_TYPE: {
CELL *res = args[0];
CELL **argz = (CELL **)args;
for (i = 0; i < columns; i++) {
int nul = 0;
CELL max;
for (j = 1; j <= argc; j++)
if (IS_NULL_C(&argz[j][i]))
nul = 1;
else if (j == 1)
max = argz[j][i];
else if (max < argz[j][i])
max = argz[j][i];
if (nul)
SET_NULL_C(&res[i]);
else
res[i] = max;
}
return 0;
}
case FCELL_TYPE: {
FCELL *res = args[0];
FCELL **argz = (FCELL **)args;
for (i = 0; i < columns; i++) {
int nul = 0;
FCELL max;
for (j = 1; j <= argc; j++)
if (IS_NULL_F(&argz[j][i]))
nul = 1;
else if (j == 1)
max = argz[j][i];
else if (max < argz[j][i])
max = argz[j][i];
if (nul)
SET_NULL_F(&res[i]);
else
res[i] = max;
}
return 0;
}
case DCELL_TYPE: {
DCELL *res = args[0];
DCELL **argz = (DCELL **)args;
for (i = 0; i < columns; i++) {
int nul = 0;
DCELL max;
for (j = 1; j <= argc; j++)
if (IS_NULL_D(&argz[j][i]))
nul = 1;
else if (j == 1)
max = argz[j][i];
else if (max < argz[j][i])
max = argz[j][i];
if (nul)
SET_NULL_D(&res[i]);
else
res[i] = max;
}
return 0;
}
default:
return E_INV_TYPE;
}
}
columns
int columns
Definition calc.c:11
max
#define max(a, b)
Definition pngdriver/draw_bitmap.c:22
f_max
int f_max(int argc, const int *argt, void **args)
Definition xmax.c:11