/*-------------------<-- Start of Description-->---------------------\
| Retrieve the column number of a variable from a dataset;           |
| Can be used to check to see if a dataset has a variable;           |
|---------------------<-- End of Description-->----------------------|
|--------------------------------------------------------------------|
|------------<-- Start of Files or Arguments Needed-->---------------|
| arguments:                                                         |
|    indata = the name of a data set you want to explore;            |
|    varname   = variable name;                                      |
|-------------<-- End of Files or Arguments Needed-->----------------|
|--------------------------------------------------------------------|
|------------------<-- Start of Files Created-->---------------------|
| Example: %varnum(one, pt); / %varnum(one, pt);                     |
| Usage:   %varnum(indata,varname);                                  |
\-------------------<-- End of Files Created-->---------------------*/
%macro varnum(indata,varname);
/*--------------------------------------------\
| Copy Right: Duo Zhou;                       |
| Created:  3-3-2001 11:27pm;                 |
| Modified: 8-30-2001 9:24pm;                 |
| Purpose:  Return the column of a variable in|
|           the dataset;                      |
\--------------------------------------------*/
%local _varnumdsid_ _varnumrc_;
%let _varnumdsid_=%sysfunc(open(&indata));
%if &_varnumdsid_ %then %do;
   %if (%length(&varname)>0) %then %do;
      %if %sysfunc(varnum(&_varnumdsid_,&varname)) %then %sysfunc(varnum(&_varnumdsid_,&varname));
      %else 0;
   %end;
   %let _varnumrc_=%sysfunc(close(&_varnumdsid_));
%end;
%else %do;
   %put ==> Alert! Open data set "&indata" failed.; 0
%end;
%mend varnum;
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