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/*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
- This software is distributed in the hope that it will be
- useful, but with NO WARRANTY OF ANY KIND.
- No author or distributor accepts responsibility to anyone for the
- consequences of using this software, or for whether it serves any
- particular purpose or works at all, unless he or she says so in
- writing. Everyone is granted permission to copy, modify and
- redistribute this source code, for commercial or non-commercial
- purposes, with the following restrictions: (1) the origin of this
- source code must not be misrepresented; (2) modified versions must
- be plainly marked as such; and (3) this notice may not be removed
- or altered from any source or modified source distribution.
*====================================================================*/
/*
* extrematest.c
*
* Tests procedure for locating extrema (minima and maxima)
* of a sampled function.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "allheaders.h"
main(int argc,
char **argv)
{
l_int32 i, ival, n;
l_float32 f, val;
GPLOT *gplot;
NUMA *na1, *na2, *na3;
static char mainName[] = "extrematest";
if (argc != 1)
return ERROR_INT("Syntax: extrematest", mainName, 1);
na1 = numaCreate(500);
for (i = 0; i < 500; i++) {
f = 48.3 * sin(0.13 * (l_float32)i);
f += 63.4 * cos(0.21 * (l_float32)i);
numaAddNumber(na1, f);
}
gplot = gplotCreate("junktest", GPLOT_X11, "Extrema test", "x", "y");
gplotAddPlot(gplot, NULL, na1, GPLOT_LINES, "plot 1");
na2 = numaFindExtrema(na1, 38.3);
n = numaGetCount(na2);
na3 = numaCreate(n);
for (i = 0; i < n; i++) {
numaGetIValue(na2, i, &ival);
numaGetFValue(na1, ival, &val);
numaAddNumber(na3, val);
}
gplotAddPlot(gplot, na2, na3, GPLOT_POINTS, "plot 2");
gplotMakeOutput(gplot);
gplotDestroy(&gplot);
numaDestroy(&na1);
numaDestroy(&na2);
numaDestroy(&na3);
return 0;
}
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