问一个SAS macro 的missing value问题

shiyiming · 发表于 2013-9-21 06:11:18

怎么样能让一个MACRO 变量等于missingvalue.
i.e.%if x='' %then %do; ...%end; /*x is a macro variable*/
问题是这样写就无法运行，请教大牛，如何实现%if x=' ' %then %do;?

thx!!!

shiyiming · 发表于 2013-9-22 13:51:36

[code:1rti6adh]试试这个：%if "&x" eq "" %then %do;.......%end;[/code:1rti6adh]

shiyiming · 发表于 2013-9-23 16:45:33

[code:2uh3hzv9]

%if &x = %then %do;
more code...;
%end;

[/code:2uh3hzv9]

shiyiming · 发表于 2013-9-23 22:56:08

goodness, I forgot the '&' sign be fore x.
both of your solution work very well, thx a lot!

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Re: 问一个SAS macro 的missing value问题