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标题: looking help for an effective summation approach [打印本页]

作者: shiyiming 时间: 2012-1-2 13:40
标题: looking help for an effective summation approach
%let x1=2;
%let x2=9;
%let x3=0;
...
%let x50=11;

Suppose Xs above were generated into series of macro variables x1 - x50.
my question, what is the effective way to sum them up?
I tried:

%let sum_x=%sysfunc(&x1.,&x2.,...,&x50.);

but it looks pretty much stupid.
so just wonder anyone can help?

thanks lot and happy new year!

作者: shiyiming 时间: 2012-5-17 21:39
标题: Re: looking help for an effective summation approach
%let x1=2;
%let x2=4;
%let x3=6;
%let x4=5;

%let s=0;

%macro summation;

%do i=1 %to 4;
%let s=%eval(&s+&&x&i);
%end;
%put &s;

%mend;
%summation;

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