1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: tabfunc.c,v 1.4 2003/07/14 20:02:29 schorsch Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Put tabular data into functions suitable for cal programs. |
6 |
* |
7 |
* 2/2/95 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 |
#include <sys/types.h> |
16 |
|
17 |
#include "rtprocess.h" /* getpid() */ |
18 |
#include "rtmath.h" |
19 |
#include "rtio.h" |
20 |
|
21 |
#define isdelim(c) (isspace(c) || (c)==',') |
22 |
|
23 |
#define MAXTAB 1024 /* maximum number of data rows */ |
24 |
#define MAXLINE 4096 /* maximum line width (characters) */ |
25 |
#define OUTFMT "%.7g" /* output format conversion string */ |
26 |
|
27 |
int interpolate = 0; |
28 |
char *progname; |
29 |
char **func; |
30 |
int nfuncs; |
31 |
|
32 |
RREAL abscissa[MAXTAB]; /* independent values (first column) */ |
33 |
RREAL (*ordinate)[MAXTAB]; /* dependent values (other columns) */ |
34 |
int tabsize = 0; /* final table size (number of rows) */ |
35 |
char locID[16]; /* local identifier (for uniqueness) */ |
36 |
|
37 |
/*extern char *fgets(), *fskip(), *absc_exp();*/ |
38 |
|
39 |
static void load_data(FILE *fp); |
40 |
static void print_funcs(char *xe); |
41 |
static void putlist(register RREAL *av, int al, register int pos); |
42 |
static char * absc_exp(void); |
43 |
|
44 |
int |
45 |
main( |
46 |
int argc, |
47 |
char **argv |
48 |
) |
49 |
{ |
50 |
progname = argv[0]; |
51 |
argv++; |
52 |
argc--; |
53 |
if (argc && !strcmp(argv[0], "-i")) { |
54 |
interpolate++; |
55 |
puts("interp_arr2`(i,x,f):(i+1-x)*f(i)+(x-i)*f(i+1);"); |
56 |
puts("interp_arr`(x,f):if(x-1,if(f(0)-x,interp_arr2`(floor(x),x,f),f(f(0))),f(1));"); |
57 |
argv++; |
58 |
argc--; |
59 |
} |
60 |
if (!argc || argv[0][0] == '-') { |
61 |
fprintf(stderr, "Usage: %s [-i] func1 [func2 ..]\n", progname); |
62 |
exit(1); |
63 |
} |
64 |
func = argv; |
65 |
nfuncs = argc; |
66 |
ordinate = (RREAL (*)[MAXTAB])malloc(nfuncs*MAXTAB*sizeof(RREAL)); |
67 |
if (ordinate == NULL) { |
68 |
fprintf(stderr, "%s: not enough memory\n", progname); |
69 |
exit(1); |
70 |
} |
71 |
sprintf(locID, "p%d", getpid()); |
72 |
load_data(stdin); |
73 |
print_funcs(absc_exp()); |
74 |
exit(0); |
75 |
} |
76 |
|
77 |
|
78 |
static void |
79 |
load_data( /* load tabular data from fp */ |
80 |
FILE *fp |
81 |
) |
82 |
{ |
83 |
int lineno; |
84 |
char *err; |
85 |
char inpbuf[MAXLINE]; |
86 |
register char *cp; |
87 |
register int i; |
88 |
|
89 |
tabsize = lineno = 0; |
90 |
inpbuf[MAXLINE-2] = '\n'; |
91 |
while (fgets(inpbuf, MAXLINE, fp) != NULL) { |
92 |
lineno++; |
93 |
if (inpbuf[MAXLINE-2] != '\n') { |
94 |
err = "line too long"; |
95 |
goto fatal; |
96 |
} |
97 |
if (tabsize >= MAXTAB-1) { |
98 |
err = "too many rows"; |
99 |
goto fatal; |
100 |
} |
101 |
if ((cp = fskip(inpbuf)) == NULL) |
102 |
continue; /* skip non-data lines */ |
103 |
abscissa[tabsize] = atof(inpbuf); |
104 |
for (i = 0; i < nfuncs; i++) { |
105 |
while (isdelim(*cp)) |
106 |
cp++; |
107 |
if (!*cp) { |
108 |
err = "too few columns"; |
109 |
goto fatal; |
110 |
} |
111 |
ordinate[i][tabsize] = atof(cp); |
112 |
if ((cp = fskip(cp)) == NULL) { |
113 |
err = "bad floating-point format"; |
114 |
goto fatal; |
115 |
} |
116 |
} |
117 |
tabsize++; |
118 |
} |
119 |
return; |
120 |
fatal: |
121 |
fprintf(stderr, "%s: input line %d: %s\n", progname, lineno, err); |
122 |
exit(1); |
123 |
} |
124 |
|
125 |
|
126 |
static char * |
127 |
absc_exp(void) /* produce expression for abscissa */ |
128 |
{ |
129 |
static char ourexp[64]; |
130 |
double step, eps; |
131 |
int uniform, increasing; |
132 |
register int i; |
133 |
|
134 |
if (tabsize < 2) |
135 |
return("1"); |
136 |
step = abscissa[1] - abscissa[0]; |
137 |
eps = ((increasing = (step > 0)) ? 1e-3 : -1e-3) * step; |
138 |
uniform = 1; |
139 |
for (i = 2; i < tabsize; i++) { |
140 |
if (uniform && fabs((abscissa[i]-abscissa[i-1]) - step) > eps) |
141 |
uniform = 0; |
142 |
if (!uniform && (abscissa[i-1] < abscissa[i]) != increasing) { |
143 |
fprintf(stderr, "%s: input not a function\n", |
144 |
progname); |
145 |
exit(1); |
146 |
} |
147 |
} |
148 |
if (uniform) { |
149 |
if (increasing && fabs(step - 1) < eps) { |
150 |
if (fabs(abscissa[0] - 1) < eps) |
151 |
strcpy(ourexp, "x"); |
152 |
else |
153 |
sprintf(ourexp, "x-%g", abscissa[0]-1); |
154 |
} else |
155 |
sprintf(ourexp, "(x-%g)/%g+1", abscissa[0], step); |
156 |
} else { |
157 |
printf("X`%s(i):select(i,", locID); |
158 |
putlist(abscissa, tabsize, 20); |
159 |
puts(");"); |
160 |
if (increasing) { |
161 |
printf("fx`%s(x):if(x-%g,if(%g-x,fx2`%s(x,%d),%d),1);\n", |
162 |
locID, abscissa[0], abscissa[tabsize-1], |
163 |
locID, tabsize, tabsize); |
164 |
printf("fx2`%s(x,i):if(x-X`%s(i),\n", locID, locID); |
165 |
} else { |
166 |
printf("fx`%s(x):if(%g-x,if(x-%g,fx2`%s(x,%d),%d),1);\n", |
167 |
locID, abscissa[0], abscissa[tabsize-1], |
168 |
locID, tabsize, tabsize); |
169 |
printf("fx2`%s(x,i):if(X`%s(i)-x,\n", locID, locID); |
170 |
} |
171 |
printf("\ti+(x-X`%s(i))/(X`%s(i+1)-X`%s(i)),\n", |
172 |
locID, locID, locID); |
173 |
printf("\tfx2`%s(x,i-1));\n", locID); |
174 |
sprintf(ourexp, "fx`%s(x)", locID); |
175 |
} |
176 |
return(ourexp); |
177 |
} |
178 |
|
179 |
|
180 |
static void |
181 |
print_funcs( /* print functions */ |
182 |
char *xe |
183 |
) |
184 |
{ |
185 |
int xelen; |
186 |
register int i; |
187 |
|
188 |
xelen = strlen(xe); |
189 |
for (i = 0; i < nfuncs; i++) { |
190 |
if ((func[i][0] == '\0') | (func[i][0] == '0')) |
191 |
continue; |
192 |
if (interpolate) { |
193 |
printf("%s`%s(i):select(i,", func[i], locID); |
194 |
putlist(ordinate[i], tabsize, |
195 |
27+strlen(func[i])); |
196 |
puts(");"); |
197 |
printf("%s(x):interp_arr`(%s,%s`%s);\n", |
198 |
func[i], xe, func[i], locID); |
199 |
} else { |
200 |
printf("%s(x):select(%s,", func[i], xe); |
201 |
putlist(ordinate[i], tabsize, strlen(func[i])+xelen+12); |
202 |
puts(");"); |
203 |
} |
204 |
} |
205 |
} |
206 |
|
207 |
|
208 |
static void |
209 |
putlist( /* put out array of values */ |
210 |
register RREAL *av, |
211 |
int al, |
212 |
register int pos |
213 |
) |
214 |
{ |
215 |
char obuf[32]; |
216 |
int len; |
217 |
|
218 |
while (al--) { |
219 |
sprintf(obuf, OUTFMT, *av++); |
220 |
pos += (len = strlen(obuf)+1); |
221 |
if (pos >= 64) { |
222 |
putchar('\n'); |
223 |
pos = len; |
224 |
} |
225 |
fputs(obuf, stdout); |
226 |
if (al) |
227 |
putchar(','); |
228 |
} |
229 |
} |