/* file: ftable.c G. Moody 24 February 2002
Last revised: 10 December 2010
Make a script for generating a table of function values using bc
*/
#include <stdio.h>
#ifdef __STDC__
#include <stdlib.h>
#include <string.h>
#endif
main(int argc, char **argv)
{
char *expression, *p, *s;
int i, nx = 0;
double xmin = -50.0;
double xmax = 50.0;
double dx = 1.0;
double x;
double atof();
if (argc < 2) {
fprintf(stderr, "usage: %s EXPRESSION [ XMIN XMAX DX ]\n", argv[0]);
exit(1);
}
expression = calloc(strlen(argv[1])+2, sizeof(char));
strcpy(expression, argv[1]);
for (s = expression; *s; s++)
if (*s == 'x') *s = '\0';
if (argc > 2) xmin = atof(argv[2]);
if (argc > 3) xmax = atof(argv[3]);
if (argc > 4) dx = atof(argv[4]);
for (x = xmin; x <= xmax; x += dx) {
printf("print %f,\" \";", x);
for (p = expression; p <= s; ) {
fputs(p, stdout);
p += strlen(p) + 1;
if (p <= s)
printf("%f", x);
}
printf("\n");
}
}