为什么我的宏变量不能解析? [英] Why won't my macro variable resolve?

问题描述

我有一个宏变量 &myvar，但是当我尝试将它放入数据步骤变量时它无法解析.为什么不行，我该怎么做才能解决这个问题?

I have a macro variable, &myvar, but it won't resolve when I try to put it in a data step variable. Why won't it, and what can I do to fix this?

%let myvar=Hello, world;
data _null_;
  x='&myvar.';
  put x=;
run;

推荐答案

SAS 中的宏变量在单引号中时无法解析，'&myvar'.它们需要用双引号括起来，"&myvar"，以便正确解析.

Macro variables in SAS won't resolve when they are in single quotes, '&myvar'. They need to be in double quotes, "&myvar", in order to resolve properly.

如果您需要单引号和解析的宏变量，您有几个选择，但最简单的是:

If you need to have single quotes and a resolved macro variable, you have a few options, but the simplest is:

%str(%'&myvar.%')

%str 中的 %' 将单独在文本字符串中放置一个单引号字符(或撇号)，而不会导致它被引用.

The %' inside of %str will place a single quote character (or apostrophe) in the text string by itself without causing it to be quoted.

data _null_;
  x="%str(%'&myvar.%')";
  put x=;
run;

或

%let myvar2 = %str(%'&myvar.%');

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