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<html><head><title>Funtools FAQ: Programming</title></head>
<ol>
<li><a name="faq1"><b>What are the compile/link commands for various platforms?</b></a>
<P>
Assuming, for example, that funtools is installed in /soft/saord and that
gcc is the compiler being used:
<ol>
<li> Linux:
<BLOCKQUOTE><CODE>
<PRE>
gcc -g -I/soft/saord/include -c -o foo.o foo.c
gcc -g foo.o -o foo -L/soft/saord/lib -lfuntools -ldl -lm
</PRE>
</CODE></BLOCKQUOTE>
<li> Apple OS X:
<BLOCKQUOTE><CODE>
<PRE>
gcc -g -no-cpp-precomp -fno-common -I/soft/saord/include -c -o foo.o foo.c
gcc -g foo.o -o foo -L/soft/saord/lib -lfuntools -lm
</PRE>
</CODE></BLOCKQUOTE>
<li> Sun Solaris:
<BLOCKQUOTE><CODE>
<PRE>
gcc -g -no-cpp-precomp -fno-common -I/soft/saord/include -c -o foo.o foo.c
gcc -g foo.o -o foo -L/soft/saord/lib -lfuntools -lsocket -lnsl -ldl -lm
</PRE>
</CODE></BLOCKQUOTE>
</ol>
<li><a name="faq2"><b>What is the simplest possible program?</b></a>
<P>
<BLOCKQUOTE><CODE>
<PRE>
#include <stdlib.h>
#include <funtools.h>
int main(int argc, char **argv)
{
Fun fun;
/* sanity check */
if( argc < 2 ) return 1;
/* open file for reading */
if( !(fun=FunOpen(argv[1], "r", NULL)) ){
fprintf(stderr, "ERROR: can't open funtools file: %s\n", argv[1]);
return 1;
}
/* close file */
FunClose(fun);
return 0;
}
</PRE>
</CODE></BLOCKQUOTE>
<li><a name="faq1.1"><b>How do I read and display events?</b></a>
<P>
<BLOCKQUOTE><CODE>
<PRE>#
#include <stdlib.h>
#include <funtools.h>
typedef struct evstruct{
double x, y;
int pi, pha;
} *Ev, EvRec;
int main(int argc, char **argv)
{
int i, got;
int maxrow=1024;
Ev ev, ebuf=NULL;
Fun fun;
/* sanity check */
if( argc < 2 ) return 1;
/* open file for reading */
if( !(fun=FunOpen(argv[1], "r", NULL)) ){
fprintf(stderr, "ERROR: can't open funtools file: %s\n", argv[1]);
return 1;
}
/* select columns to read (and data types to convert to) */
got = FunColumnSelect(fun, sizeof(EvRec), NULL,
"x", "D", "r", FUN_OFFSET(Ev, x),
"y", "D", "r", FUN_OFFSET(Ev, y),
"pha", "J", "r", FUN_OFFSET(Ev, pha),
"pi", "J", "r", FUN_OFFSET(Ev, pi),
NULL);
/* read and process events */
while( (ebuf=(void *)FunTableRowGet(fun, NULL, maxrow, NULL, &got)) && got ){
for(i=0; i<got; i++){
ev = (Ev)ebuf+i;
fprintf(stdout, "%.1f %.1f %d %d\n", ev->x, ev->y, ev->pha, ev->pi);
}
if( ebuf) free(ebuf);
}
/* close file */
FunClose(fun);
return 0;
}
</PRE>
</CODE></BLOCKQUOTE>
<li><a name="faq1.2"><b>How do I change the value of a single column in all events?</b></a>
<P>
<BLOCKQUOTE><CODE>
<PRE>
#include <stdlib.h>
#include <funtools.h>
typedef struct evstruct{
int pi;
} *Ev, EvRec;
int main(int argc, char **argv)
{
int i, got;
int maxrow=1024;
Ev ev, ebuf=NULL;
Fun fun, ofun;
/* sanity check */
if( argc < 3 ) return 1;
/* open file for reading */
if( !(fun=FunOpen(argv[1], "r", NULL)) ){
fprintf(stderr, "ERROR: can't open input funtools file: %s\n", argv[1]);
return 1;
}
/* open output file and inherit header params, columns, etc. from input */
if( !(ofun=FunOpen(argv[2], "w", fun)) ){
fprintf(stderr, "ERROR: can't open output funtools file: %s\n", argv[2]);
return 1;
}
/* select columns to read (and data types to convert to) */
/* use "merge=update" to change value while keeping original data type */
/* use "merge=replace" to change boh the value and data type */
got = FunColumnSelect(fun, sizeof(EvRec), "merge=update",
"pi", "J", "rw", FUN_OFFSET(Ev, pi),
NULL);
/* read and process events */
while( (ebuf=(void *)FunTableRowGet(fun, NULL, maxrow, NULL, &got)) && got ){
for(i=0; i<got; i++){
ev = (Ev)ebuf+i;
ev->pi = ev->pi + 1;
}
/* write rows to output file */
if( FunTableRowPut(ofun, ebuf, got, 0, NULL) != got ){
fprintf(stderr, "ERROR: writing to funtools file: %s\n", argv[2]);
return 1;
}
if( ebuf) free(ebuf);
}
/* close files */
FunClose(ofun);
FunClose(fun);
return 0;
}
</PRE>
</CODE></BLOCKQUOTE>
<li><a name="faq1.3"><b>How do I process events based on the region each is in?</b></a>
<P>
<BLOCKQUOTE><CODE>
<PRE>
#include <stdlib.h>
#include <funtools.h>
typedef struct evstruct{
int x, y;
int pi, pha;
int region;
} *Ev, EvRec;
int main(int argc, char **argv)
{
int i, got;
int maxrow=1024;
Ev ev, ebuf=NULL;
Fun fun;
/* sanity check */
if( argc < 2 ) return 1;
/* open file for reading */
if( !(fun=FunOpen(argv[1], "r", NULL)) ){
fprintf(stderr, "ERROR: can't open funtools file: %s\n", argv[1]);
return 1;
}
/* select columns to read (and data types to convert to) */
/* specifying $REGION will retrieve the one-indexed region number */
/* events passing the filter but not in a region will have value -1 */
got = FunColumnSelect(fun, sizeof(EvRec), NULL,
"x", "J", "r", FUN_OFFSET(Ev, x),
"y", "J", "r", FUN_OFFSET(Ev, y),
"pha", "J", "r", FUN_OFFSET(Ev, pha),
"pi", "J", "r", FUN_OFFSET(Ev, pi),
"$REGION", "J", "r", FUN_OFFSET(Ev, region),
NULL);
/* read and process events */
while( (ebuf=(void *)FunTableRowGet(fun, NULL, maxrow, NULL, &got)) && got ){
for(i=0; i<got; i++){
ev = (Ev)ebuf+i;
fprintf(stdout, "%4d %4d %3d %3d %4d\n",
ev->x, ev->y, ev->pha, ev->pi, ev->region);
}
if( ebuf) free(ebuf);
}
/* close file */
FunClose(fun);
return 0;
}
</PRE>
</CODE></BLOCKQUOTE>
<li><a name="faq1.4"><b>How do I make a FITS event file from a non-FITS source (and add my own params)?</b></a>
<P>
<BLOCKQUOTE><CODE>
<PRE>
#include <stdlib.h>
#include <funtools.h>
typedef struct evstruct{
int x, y;
int pha;
float pi;
} *Ev, EvRec;
int main(int argc, char **argv)
{
int i, nev;
int pmod=16, put=1;
double pinc=0.1234;
char xbuf[32], ybuf[32];
Ev ev;
Fun ofun;
/* sanity check */
if( argc < 3 ) return 1;
/* open new file for writing */
if( !(ofun=FunOpen(argv[1], "w", NULL)) ){
fprintf(stderr, "ERROR: can't open funtools file: %s\n", argv[1]);
return 1;
}
if( (nev = atoi(argv[2])) <=0 ) return 1;
ev = (Ev)calloc(1, sizeof(EvRec));
/* The pair of numeric values specify the data value range, used to bin
x, y into an image. They are permitted but not needed for pi and pha */
sprintf(xbuf, "J:1:%d", nev);
sprintf(ybuf, "J:1:%d", nev);
/* select columns to write */
FunColumnSelect(ofun, sizeof(EvRec), NULL,
"x", xbuf, "w", FUN_OFFSET(Ev, x),
"y", ybuf, "w", FUN_OFFSET(Ev, y),
"pha", "J:1:16", "w", FUN_OFFSET(Ev, pha),
"pi", "E", "w", FUN_OFFSET(Ev, pi),
NULL);
/* write params to header; generally added before first event is written */
FunParamPuti(ofun, "PMOD", 0, pmod, "modulus for pha generation", 1);
FunParamPutd(ofun, "PINC", 0, pinc, 7, "increment for pi generation", 1);
/* make up events */
for(i=1; i<=nev; i++){
ev->x = i; ev->y = nev-i+1; ev->pha = i % pmod; ev->pi = ev->pha + pinc;
/* write rows to output file -- this can be done in batches, of course */
if( FunTableRowPut(ofun, ev, put, 0, NULL) != put ){
fprintf(stderr, "ERROR: writing to funtools file: %s\n", argv[1]);
return 1;
}
}
if( ev) free(ev);
/* close file */
FunClose(ofun);
return 0;
}
</PRE>
</CODE></BLOCKQUOTE>
<li><a name="faq2.1"><b>How do I process an image in double float format?</b></a>
<P>
<BLOCKQUOTE><CODE>
<PRE>
#include <stdlib.h>
#include <funtools.h>
int main(int argc, char **argv)
{
int i, j, dim1, dim2;
double *buf;
Fun fun;
/* sanity check */
if( argc < 2 ) return 1;
/* open file for reading */
if( !(fun=FunOpen(argv[1], "r", NULL)) ){
fprintf(stderr, "ERROR: can't open funtools file: %s\n", argv[1]);
return 1;
}
/* extract (and bin, if necessary) data into a double prec. image buffer */
if( !(buf = FunImageGet(fun, NULL, "bitpix=-64")) ){
fprintf(stderr, "ERROR: can't get image: %s\n", argv[1]);
return 1;
}
/* get image dimensions after FunImageGet, in case an image section
was specified on the command line, which changes image dimensions */
FunInfoGet(fun, FUN_SECT_DIM1, &dim1, FUN_SECT_DIM2, &dim2, 0);
/* loop through image */
for(i=0; i<dim2; i++){
for(j=0; j<dim1; j++){
fprintf(stdout, "%.1f ", buf[i*dim1+j]);
}
fprintf(stdout, "\n");
}
/* close file */
FunClose(fun);
return 0;
}
</PRE>
</CODE></BLOCKQUOTE>
<li><a name="faq2.1"><b>How do I process an image in its native format?</b></a>
<BLOCKQUOTE><CODE>
<PRE>
#include <funtools.h>
int main(int argc, char **argv)
{
int i, j, bitpix, dim1, dim2;
double *buf;
unsigned char *cbuf;
short *sbuf;
int *ibuf;
float *fbuf;
double *dbuf;
Fun fun;
/* sanity check */
if( argc < 2 ) return 1;
/* open file for reading */
if( !(fun=FunOpen(argv[1], "r", NULL)) ){
fprintf(stderr, "ERROR: can't open funtools file: %s\n", argv[1]);
return 1;
}
/* extract (and bin, if necessary) data into a buffer whose
data type is not specified and therefore is that of the file */
if( !(buf = FunImageGet(fun, NULL, NULL)) ){
fprintf(stderr, "ERROR: can't get image: %s\n", argv[1]);
return 1;
}
/* get image dimensions after FunImageGet, in case an image section
was specified on the command line, which changes image dimensions */
FunInfoGet(fun, FUN_SECT_BITPIX, &bitpix,
FUN_SECT_DIM1, &dim1, FUN_SECT_DIM2, &dim2, 0);
/* set appropriate data type buffer to point to image buffer */
switch(bitpix){
case 8: cbuf = (unsigned char *)buf; break;
case 16: sbuf = (short *)buf; break;
case 32: ibuf = (int *)buf; break;
case -32: fbuf = (float *)buf; break;
case -64: dbuf = (double *)buf; break;
}
/* loop through image */
for(i=0; i<dim2; i++){
for(j=0; j<dim1; j++){
switch(bitpix){
case 8: fprintf(stdout, "%4d ", cbuf[i*dim1+j]); break;
case 16: fprintf(stdout, "%6d ", sbuf[i*dim1+j]); break;
case 32: fprintf(stdout, "%9d ", ibuf[i*dim1+j]); break;
case -32: fprintf(stdout, "%.2f ", fbuf[i*dim1+j]); break;
case -64: fprintf(stdout, "%.6f ", dbuf[i*dim1+j]); break;
}
}
fprintf(stdout, "\n");
}
/* close file */
FunClose(fun);
return 0;
}
</PRE>
</CODE></BLOCKQUOTE>
</ol>
|
