如何使用SAS中的计算从现有宏变量创建新的宏变量？

Question

我想从已经存在的其他宏变量中创建一个新的宏变量。

我尝试了call symput，%eval和input的多种变体无效...

我希望d评估为3/30 = .10。

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*****  taken directly from the sas help files...  ;

%let a=1+2;
%let b=10*3;
%let c=5/3;
%let eval_a=%eval(&a);
%let eval_b=%eval(&b);
%let eval_c=%eval(&c);

%put &a is &eval_a;
%put &b is &eval_b;
%put &c is &eval_c; * not sure why this evaluates to 1, but I'm sure it's documented somewhere... ;


*****  This evaluates to 0...

%let d = %eval(%eval(&a) / %eval(&b)) ; 

%put &d ;

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非常感谢...

Answer 1

％eval只会返回一个整数。要获得小数，您需要使用％sysevalf。