Hi,
I copied a piece of C code from online www.stata.com/plugins Section 8b, 8d.
to test -SF_mat_el()-. My question is how I can see/check the contents of
matrix elements.
If I included the following code, given in Section 8d for debugging and
printing out results, the C compiler reported errors (I use Microsoft Visual
C++ 6). I changed "snprintf" to "sprintf", errors are gone, but warnings are
still there.
/* --------------- Begin change12.c-----------------------------------*/
#include <stdio.h>
#include <string.h>
#include "stplugin.h"
STDLL stata_call(int argc, char *argv[])
{
char buf[80];
ST_double z;
SF_mat_el(argv[0],1,2,&z);
snprintf(buf, 80, "The value of z is %lf\n",z);
SF_display(buf);
return(0) ;
}
/* --- End change12.c (see www.stata.com\plugins Section 8b) ------*/
Importantly, when running the last line of the following code test.do,
either STATA winddow disappeared, or STATA reported "cannot read memory"
//---------- Begin test.do (Section 8b)----------------------
tempname mymat
mat `mymat'=(1,2 \3,4)
program change12, plugin using("c:\ado\personal\c\changemx.dll")
plugin call change12, `mymat'
// --------- End test.do ------------------------------------
Interestingly, if I don't print out the result, the programs work fine.
But how can I know programs work correctly?
Thanks a lot,
Lei
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