SAS Macro GLOBAL范围

Question

是否有一种简短的方法可以在范围内的宏全局内创建所有宏变量？

即:

%macro x;  
 %global _all_;  * ??? ;  
 %let x=1;  
 %let y=1;  
 %let z=1;  
%mend;

Answer 1

我可以想到这样做的唯一方法,而不必提前将每个宏声明为全局,然后执行%let语句就是使用宏来代替%let语句.

在下面的代码中,我创建了一个名为%mylet的宏,其唯一目的是创建一个全局变量,其名称和值作为参数传递.然后我使用这个宏代替%let,我想要定义全局变量.

例如.

%global myvar;
%let myvar=2;

会成为...

%mylet(myvar,2);

/* Define a macro to declare variables as global */
%macro mylet(var,value);
  %global &var;
  %let &var.= &value ;
%mend;

/* Test macro */
%macro test;
 %mylet(myvar,2);
 %mylet(myvar2,12);
 %mylet(myvar3,'string');

/* see that they are global inside the macro */
title "Macro scope inside test macro";
proc sql;
    select *
       from dictionary.macros
       where name in('MYVAR','MYVAR2','MYVAR3');
quit;

%mend;
%test;

/* Check to see if they are still global outside the macro */
title "Macro scope outside test macro";
proc sql;
    select *
       from dictionary.macros
       where name in('MYVAR','MYVAR2','MYVAR3');
quit;