histogram.cpp

/*****************************************************
Evaluate histograms of solute levels.  TWS December 07.
Version 2.0, May 1, 2010.
Version 3.0, May 17,2011.
******************************************************/
#define _CRT_SECURE_NO_DEPRECATE

#include <math.h>
#include "nrutil.h"
#include <stdio.h>
#include <string.h>

void histogram(const char fname[])
{
	extern int mxx, myy, mzz, nnt, nnv, nseg, nnod, nsp;
	extern float *pmin, *pmax, *pmeant, *pref, **pt;

	int i, j, itp, isp, nctop, ncbot, nstat, nstatm = 101;
	float step, dev;
	float *po2samp, *stat, *cumu, *mstat;
	FILE *ofp;

	po2samp = vector(1, nstatm);
	stat = vector(1, nstatm);
	cumu = vector(1, nstatm);
	mstat = vector(1, nstatm);

	ofp = fopen(fname, "w");
	for (isp = 1; isp <= nsp; isp++) {
		step = pref[isp] / 100;
		nctop = pmax[isp] / step + 1.;
		if (nctop > 100) nctop = 100;
		ncbot = pmin[isp] / step;
		if (ncbot <= 2) ncbot = 0;
		nstat = nctop - ncbot + 1;
		dev = 0.;
		if (nstat > nstatm) printf("*** nstatm too small in histogram\n");
		for (i = 1; i <= nstat; i++) {
			po2samp[i] = step * (i - 1 + ncbot);
			mstat[i] = 0;
		}
		for (itp = 1; itp <= nnt; itp++) {
			dev += SQR(pmeant[isp] - pt[itp][isp]);
			for (j = 1; j <= nstat; j++)	if (pt[itp][isp] <= po2samp[j]) {
				mstat[j] = mstat[j] + 1;
				goto binned;
			}
		binned:;
		}
		dev = sqrt(dev / nnt);
		for (i = 1; i <= nstat; i++) stat[i] = mstat[i] * 100. / nnt;
		cumu[1] = stat[1];
		for (i = 2; i <= nstat; i++) cumu[i] = cumu[i - 1] + stat[i];

		fprintf(ofp, "Histogram data for solute %i\n", isp);
		fprintf(ofp, "value  %% cumul. %%\n");
		for (i = 1; i <= nstat; i++) fprintf(ofp, "%g %7.2f %7.2f\n", po2samp[i], stat[i], cumu[i]);
		fprintf(ofp, "Mean = %f deviation = %f min = %f max  = %f\n", pmeant[isp], dev, pmin[isp], pmax[isp]);
	}
	fclose(ofp);
	free_vector(po2samp, 1, nstatm);
	free_vector(stat, 1, nstatm);
	free_vector(cumu, 1, nstatm);
	free_vector(mstat, 1, nstatm);
}