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root/radiance/ray/src/cal/histo.c
Revision: 1.2
Committed: Sun Jun 8 12:03:09 2003 UTC (21 years, 1 month ago) by schorsch
Content type: text/plain
Branch: MAIN
Changes since 1.1: +54 -46 lines
Log Message:
Reduced compile warnings/errors on Windows.

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: histo.c,v 1.1 2003/02/22 02:07:20 greg Exp $";
3 #endif
4 /*
5 * Compute a histogram from input data
6 *
7 * 9/5/96 Greg Ward
8 */
9
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <math.h>
14 #include <ctype.h>
15
16 #define MAXCOL 64 /* maximum number of input columns */
17 #define MAXDIV 1024
18
19 #define isint(x) (floor((x)+1e-6) != floor((x)-1e-6))
20
21 char *progname;
22
23 int cumulative = 0;
24
25 long histo[MAXCOL][MAXDIV];
26 double minv, maxv;
27 int ndiv;
28
29 int ncols;
30
31
32 static void
33 readinp(void) /* gather statistics on input */
34 {
35 char buf[16*MAXCOL];
36 double d;
37 register int c;
38 register char *cp;
39
40 while ((cp = fgets(buf, sizeof(buf), stdin)) != NULL) {
41 for (c = 0; c < MAXCOL; c++) {
42 while (isspace(*cp))
43 cp++;
44 if (!*cp)
45 break;
46 d = atof(cp);
47 while (*cp && !isspace(*cp))
48 cp++;
49 if (d >= minv && d < maxv)
50 histo[c][(int)(ndiv*(d-minv)/(maxv-minv))]++;
51 }
52 if (c > ncols)
53 ncols = c;
54 }
55 }
56
57
58 static void
59 printcumul(void) /* print cumulative histogram results */
60 {
61 long ctot[MAXCOL];
62 register int i, c;
63
64 for (c = ncols; c--; )
65 ctot[c] = 0L;
66
67 for (i = 0; i < ndiv; i++) {
68 printf("%g", minv + (maxv-minv)*(i+1)/ndiv);
69 for (c = 0; c < ncols; c++) {
70 ctot[c] += histo[c][i];
71 printf("\t%ld", ctot[c]);
72 }
73 putchar('\n');
74 }
75 }
76
77
78 static void
79 printhisto(void) /* print histogram results */
80 {
81 register int i, c;
82
83 for (i = 0; i < ndiv; i++) {
84 printf("%g", minv + (maxv-minv)*(i+.5)/ndiv);
85 for (c = 0; c < ncols; c++)
86 printf("\t%ld", histo[c][i]);
87 putchar('\n');
88 }
89 }
90
91
92 int
93 main(
94 int argc,
95 char *argv[]
96 )
97 {
98 progname = argv[0];
99 if (argc > 1 && !strcmp(argv[1], "-c")) {
100 cumulative++;
101 argc--; argv++;
102 }
103 if (argc < 3)
104 goto userr;
105 minv = atof(argv[1]);
106 maxv = atof(argv[2]);
107 if (argc == 4)
108 ndiv = atoi(argv[3]);
109 else {
110 if (argc > 4 || !isint(minv) || !isint(maxv))
111 goto userr;
112 maxv += 0.5;
113 minv -= 0.5;
114 ndiv = maxv - minv + 0.5;
115 }
116 if (minv >= maxv | ndiv <= 0)
117 goto userr;
118 if (ndiv > MAXDIV) {
119 fprintf(stderr, "%s: maximum number of divisions: %d\n",
120 progname, MAXDIV);
121 goto userr;
122 }
123 readinp();
124 if (cumulative)
125 printcumul();
126 else
127 printhisto();
128 exit(0);
129 userr:
130 fprintf(stderr, "Usage: %s [-c] min max n\n", progname);
131 fprintf(stderr, " Or: %s [-c] imin imax\n", progname);
132 exit(1);
133 }
134
135