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io_ascii.c
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	#include "io_ascii.h"
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <math.h>

	/* -------------------------------------------------------------------------- */
	int write_to_file(int n, float ** x, unsigned int iter, float minval,
	float maxval) {
	FILE * fp;
	char filename[256];
	char prefix[] = "out_";
	char suffix[] = ".pgm";
	char number[5];

	int i, j, lines;
	int v;

	strcpy(filename, prefix);
	sprintf(number, "%u", iter);
	while (iter < 1000) {
	strcat(filename, "0");
	if (iter == 0)
	iter = 1;
	iter *= 10;
	}
	strcat(filename, number);
	strcat(filename, suffix);
	fp = fopen(filename, "w");
	if (fp == NULL) {
	fprintf(stderr, "Can't open output file %s!\n", filename);
	exit(1);
	}

	fprintf(fp, "%s\n%s\n", "P2", "# CREATOR: poisson program");
	fprintf(fp, "%d %d\n", n, n);
	fprintf(fp, "%d\n", 255);

	lines = 4;

	for (i = 0; i < n; i++) {
	for (j = 0; j < n; j++) {
	v = (int)roundf(255 * (x[i][j] - minval) / (maxval - minval));
	v = v <= 255 ? v : 255;
	fprintf(fp, "%d \n", (int)(v));
	lines++;
	}
	}

	fclose(fp);
	printf("%d lines written to file %s\n", lines, filename);
	return 0;
	}

	/* -------------------------------------------------------------------------- */
	int colormap(int n) {
	FILE * fp;
	int i, j;
	double v;
	fp = fopen("colormap.pgm", "w");

	fprintf(fp, "%s\n%s\n", "P2", "# CREATOR: poisson program");
	fprintf(fp, "%d %d\n", 20, n);
	fprintf(fp, "%d\n", 255);

	for (j = 0; j < n; j++) {
	v = (int)roundf(255.0 * j / (n - 1));
	for (i = 0; i < 20; i++) {
	fprintf(fp, "%d \n", (int)(v));
	}
	}

	fclose(fp);
	return 0;
	}