Using SAS/IML Software to Generate IML Statements

Macro Interface

The pushed text is scanned by the macro processor; therefore, the text can contain macro instructions. For example, here is an all-purpose routine that shows what the expansion of any macro is, assuming that it does not have embedded double quotes:

  
        /* function: y = macxpand(x);                         */ 
        /* macro-processes the text in x                      */ 
        /* and returns the expanded text in the result.       */ 
        /* Do not use double quotes in the argument.          */ 
        /*                                                    */ 
    start macxpand(x); 
       call execute('Y="',x,'";'); 
       return(y); 
    finish;
 

Consider the following statements:

  
    %macro verify(index); 
        data _null_; 
           infile junk&index; 
           file print; 
           input; 
           put _infile_; 
        run; 
    %mend; 
    y = macxpand('%verify(1)'); 
    print y;
 

The output produced is as follows:

  
        Y 
  
        DATA _NULL_;      INFILE JUNK1;      FILE PRINT;      INPUT; 
        PUT _INFILE_;      RUN;