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- /*
- * $Header: /files1/home/toy/src/stat/RCS/siline.c,v 1.3 90/09/04 18:34:13 toy Exp $
- * NAME
- * siline - generate a line given the slope and intercept
- *
- * SYNOPSIS
- * siline [-H] [-P prec] [-c cols] [-i intercept] [-n nsamps] [-s slope]
- * [vectors ...]
- *
- * DESCRIPTION
- * Output is a line with the given slope and intercept
- *
- * HISTORY
- * $Log: siline.c,v $
- * Revision 1.3 90/09/04 18:34:13 toy
- * Wasn't printing out the help strings!
- *
- * Revision 1.2 90/09/04 17:40:51 toy
- * Set default precision from the environment variable STAT_PREC.
- * Use print_help_strings to print out help.
- *
- * Revision 1.1 90/09/02 17:52:57 toy
- * Initial revision
- *
- */
-
- #include <stdio.h>
-
- #if defined(__STDC__) || defined(__GNUC__)
- #include <stddef.h>
- #include <stdlib.h>
- #endif
-
- #include "gps.h"
-
- #define DEF_PROGNAME "siline"
-
- static const char RCSID[] = "@(#) $Id: siline.c,v 1.3 90/09/04 18:34:13 toy Exp $";
-
- extern int getopt ();
- extern int optind;
- extern char *optarg;
-
- extern long random PARMS ((void));
- extern void srandom PARMS ((unsigned));
-
- const char *progname;
-
- #define OPT_STRING "HP:c:i:n:s:"
-
- void
- help ()
- {
- static const char *help_strings[] =
- {
- "\t-H\tThis help\n",
- "\t-P p\tSet number of significant digits to p. If not specified\n",
- "\t\tuse value of STAT_PREC from environment, if available. Else\n",
- "\t\tuse default.\n",
- "\t-c c\tSet number of output elements per line to n\n",
- "\t-i i\tIntercept of line, default = 0\n",
- "\t-n n\tNumber of positive integers for x\n",
- "\t-s s\tSlope of line, default = 1\n",
- "The output consists of values from a line with the given\n",
- "slope and intercept: y = slope * x + intercept. The x values\n",
- "are taken from the vectors, if given, or from stdin. If -n is\n",
- "given, the x values are the sequence of positive integers from 1\n",
- "to n.\n",
- NULL
- };
-
- (void) fprintf (stderr, "%s\n", RCSID);
- (void) fprintf (stderr, "Usage: %s [-H] [-P prec] [-c cols] [-i intercept] [-n nsamp] [-s slope]\n", progname);
- (void) fprintf (stderr, "\t\t[vectors ...]\n");
- print_help_strings (help_strings);
- }
-
-
- int
- main (argc, argv)
- int argc;
- char *argv[];
- {
- int option;
- int errcnt;
- int k;
- int got_nsamp;
- int nsamp;
- double intercept;
- double slope;
- double x;
-
- progname = get_my_name (argv[0], DEF_PROGNAME);
- set_def_prec ();
-
- /*
- * Read options
- */
-
- errcnt = 0;
- got_nsamp = FALSE;
- intercept = 0;
- slope = 1;
-
- while ((option = getopt (argc, argv, OPT_STRING)) != -1)
- {
- switch (option)
- {
- case 'H': /* Help */
- help ();
- exit (0);
- break;
- case 'P': /* Precision */
- (void) set_precision (atoi (optarg));
- break;
- case 'c': /* Number of columns */
- (void) set_max_columns (atoi (optarg));
- break;
- case 'i': /* Intercept */
- if (sscanf (optarg, "%lf", &intercept) != 1)
- {
- message ("cannot read -i value: `%s'\n", optarg);
- errcnt++;
- }
- break;
- case 'n': /* Number of positive integers */
- if (sscanf (optarg, "%d", &nsamp) != 1)
- {
- message ("cannot read -n value: `%s'\n", optarg);
- errcnt++;
- }
- else
- {
- got_nsamp = TRUE;
- }
- break;
- case 's': /* Slope of line */
- if (sscanf (optarg, "%lf", &slope) != 1)
- {
- message ("cannot read -s value: `%s'\n", optarg);
- errcnt++;
- }
- break;
- default:
- break;
- } /* endswitch */
- } /* endwhile */
-
- /*
- * Exit if any errors found
- */
- if (errcnt > 0)
- {
- exit (1);
- }
-
- /*
- * Generate the desired line
- */
-
- if (got_nsamp)
- {
- for (k = 1; k <= nsamp; k++)
- {
- print_number (stdout, intercept + slope * k);
- }
- }
- else
- {
- while (optind < argc)
- {
- if (freopen (argv[optind], "r", stdin) == NULL)
- {
- message ("cannot open file `%s'\n", argv[optind]);
- exit (1);
- }
- while (get_number (stdin, &x) == 1)
- {
- print_number (stdout, intercept + slope * x);
- }
- optind++;
- }
- }
-
- end_column (stdout);
- return 0;
- }
-