topic Re: macro code logic in SAS Programming

macro code logic

RTelang — Mon, 07 Dec 2015 10:55:09 GMT

A macro that identifies any variables either character or numeric – for which all of the observations are missing values. When this occurs, a warning message is output to the SAS log.

%macro vtype(dsname=, varname=, outputflag=);
%if %sysfunc(exist(&dsname)) %then %do;
%let dsid = %sysfunc(open(&dsname));
%let varnum = %sysfunc(varnum(&dsid,&varname));
%let vartyp = %sysfunc(vartype(&dsid,&varnum));
%if &vartyp = C %then %do;
%let &outputflag=&vartyp;
%put &varname=character;
%end;
%else %if &vartyp = N %then %do;
%let &outputflag=&vartyp;
%put &varname=numeric;
%end;
%end;
%else %put "DSNAME parameter is invalid Please pass appropriate values.";
%mend vtype;

this my code how can i change it according to my requirment?

Re: macro code logic

And — Mon, 07 Dec 2015 12:10:07 GMT

Hello,

You can check for missing values using proc sql:

proc sql noprint;
select max(&varname) into :max_value from &dsname;
quit;

and afterwards just check the value of the newly created macro variable:

%if &max_value= or &max_value=. %then %do; %put &varname has only missing values;%end;

Re: macro code logic

Astounding — Mon, 07 Dec 2015 13:56:08 GMT

It's extremely unlikely that missing values could cause a problem. Here are two other situations that are more likely candidates.

(1) Even if DSNAME does not exist, your macro still attempts to extract VARNUM to identify the position of VARNAME.

(2) If DSNAME exists but does not contain VARNAME, your macro still attempts to extract whether VARNAME is numeric or character.

I would be shocked if SAS even examines the values of VARNAME. The problem almost certainly lies elsewhere.

Good luck.

Re: macro code logic

RTelang — Tue, 08 Dec 2015 05:15:19 GMT

@And thanks my prog runs well, but y aren't u using count instead of max??

Re: macro code logic

RTelang — Tue, 08 Dec 2015 05:53:42 GMT

@And how do i incorporate ur code in my code? am having errors can u give all together??