54755 - Create a new data set from an existing data set with a given number of observations where new observations contain missing values

Sample 54755: Create a new data set from an existing data set with a given number of observations where new observations contain missing values

The final data set should contain 10 observations. The number of observations in A is stored in &NUM, and the difference between &NUM and 10 is stored in &DIFF. When &NUM is less than 10, execute the DATA step to add the observations with the DO loop. The newly added observations contain missing values for all variables.

data a;
   do i=1 to 3;
      a=i+2;
      output;
   end;
run;

%let dsid=%sysfunc(open(a100));
%let num=%sysfunc(attrn(&dsid,nobs));
%let rc=%sysfunc(close(&dsid));

%macro test;
   %if &num < 10 %then %do;
      %let diff=%sysevalf(10-&num);
      data a(drop=j);
         set a end=last;
         output;
         if last then do;
            call missing(of _all_);
            do j=1 to &diff;
               output;
            end;
         end;
      run;
   %end;
%mend test;

/* Invoke the macro */
%test

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               Obs    i    a

                 1    1    3
                 2    2    4
                 3    3    5
                 4    .    .
                 5    .    .
                 6    .    .
                 7    .    .
                 8    .    .
                 9    .    .
                10    .    .

Date Modified:	2014-12-02 15:36:34
Date Created:	2014-12-02 12:43:07

Product Family	Product	Host	SAS Release
Product Family	Product	Host	Starting	Ending
SAS System	Base SAS	z/OS	9.2 TS1M0
		Microsoft® Windows® for 64-Bit Itanium-based Systems	9.2 TS1M0
		Microsoft Windows Server 2003 Datacenter 64-bit Edition	9.2 TS1M0
		Microsoft Windows Server 2003 Enterprise 64-bit Edition	9.2 TS1M0
		Microsoft Windows XP 64-bit Edition	9.2 TS1M0
		Microsoft® Windows® for x64	9.2 TS1M0
		Microsoft Windows Server 2003 Datacenter Edition	9.2 TS1M0
		Microsoft Windows Server 2003 Enterprise Edition	9.2 TS1M0
		Microsoft Windows Server 2003 Standard Edition	9.2 TS1M0
		Microsoft Windows XP Professional	9.2 TS1M0
		Windows Vista	9.2 TS1M0
		Windows Vista for x64	9.2 TS1M0
		64-bit Enabled AIX	9.2 TS1M0
		64-bit Enabled HP-UX	9.2 TS1M0
		64-bit Enabled Solaris	9.2 TS1M0
		HP-UX IPF	9.2 TS1M0
		Linux	9.2 TS1M0
		Linux for x64	9.2 TS1M0
		OpenVMS on HP Integrity	9.2 TS1M0
		Solaris for x64	9.2 TS1M0

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Sample 54755: Create a new data set from an existing data set with a given number of observations where new observations contain missing values

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