Steps:
1. Store the number of observations in a data set to a macro variable (RECCOUNT)
2. Increment a variable (I) fromone to RECOUNT using a %DO loop
3. Use the FIRSTOBS option in a DATA step to advance to the record I
4. Store record values to macro variables using CALL SYMPUT
5. Perform any desired PROC and DATA steps
EXAMPLE:
In the following example, a log file (DATALOG) has been created of all the data sets in a library named TEST. Periodically, it is necessary to print the contents of these data sets into a series of quick reports. DATALOG consists of two columns, FILENM (the
file name) and DESC (a short description). The reports should be formatted with a standard PROC PRINT and have a title consisting of the table description. The following piece of code accomplishes that task.
/* Macro to SCAN through DATALOG */
%macro scanloop(scanfile,field1,field2);
/* First obtain the number of */
/* records in DATALOG */
data _null_;
if 0 then set &scanfile nobs=x;
call symput("reccount",x);
stop;
run;
/* loop from one to number of records */
%do i=1 %to &reccount;
/* Advance to the Ith record */
data _null_;
set &scanfile(firstobs=&i);
/* store the variables of interest in macro variables */
call symput('var1',&field1);
call symput('var2',&field2);
stop;
run;
/* now perform the tasks that wish repeated for each observation */
proc print data=&var1;
title "&var2";
%end;
%mend scanloop;
/* Call SCANLOOP */
%SCANLOOP(DATALOG,FILENM,DESC);
RUN;