st: Error with plugin

[Pradipto Banerjee <pradipto.banerjee@adainvestments.com>]

Hi,

I am trying to run the example code for Stata plugin given at http://www.stata.com/plugins/. The code I was trying to run is the example given in section 8a

---------
#include "stplugin.h"

STDLL stata_call(int argc, char *argv[])
{
        ST_int  j, k;
        ST_double       sum, z;
        ST_retcode      rc;

        if (SF_nvars() < 2) {
                return(102);                    /* not enough variables specified */
        }

        for (j=SF_in1(); j<=SF_in2(); j++) {
                if (SF_ifobs(j)) {
                        sum = 0.0 ;
                        for (k=1; k< SF_nvars(); k++) {
                                        if (rc = SF_vdata(k, j, &z)) return(rc);
                                        sum += z;
                                }
                                if (rc=SF_vstore(SF_nvars(), j, sum)) return(rc);
                        }
                }

        return (0);
}
---------

I complied it with gcc under cygwin (Windows) by following the suggestion on the Stata website: "gcc -shared -mno-cygwin stplugin.c varsum.c -o varsum.plugin". Then within Stata, I did the following:

.program varsum, plugin

.plugin call varsum, x1 x2 x3

r(102);

The expected code was supposed to add x1 & x2 and place it in x3. However, it gives "r(102)". I can't figure out what is wrong, but clearly the code views SF_nvars() as having 1 or less arguments supplied to it, even though I have supplied 3 arguments.

Any idea what might be the issue?

(p.s. To add: I am running Stata 9.2. Two other earlier examples of Section 5 & Section 7 of http://www.stata.com/plugins/ worked fine.)

By any chance, should I be using the version 1.0 of stplugin.h / stplugin.c for Stata 9.2?





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