symputx不允许我使用相同的宏函数存储不同的宏变量

时间:2019-12-11 19:43:24

标签: sas sas-macro

我试图编写一个宏函数,该宏函数从数据集中获取属性,然后将其存储为宏变量。我想以一种可以用于多个数据集和多个宏变量的方式编写此宏函数。

这是怎么回事:

%macro ExtractACell(dataset, storage_var, rownum=1, var_name=Make);
data _null_;
    set &dataset. (obs=&rownum. firstobs=&rownum. keep = &var_name.);   
    call symputx(&storage_var., &var_name., "G");
    stop;
run;
%mend ExtractACell;

每当我尝试运行时,我都会得到如下注释:

 NOTE: The quoted string currently being processed has become more than 262 bytes long.  You might have unbalanced quotation marks.
 NOTE: The quoted string currently being processed has become more than 262 bytes long.  You might have unbalanced quotation marks.
 27         %let SASWORKLOCATION="%sysfunc(getoption(work))/";

symputx是否有禁止传入表示宏变量名称的宏变量的规则?

1 个答案:

答案 0 :(得分:0)

确保扩展宏变量时正在生成有效的SAS代码。特别是这样的声明:

call symputx(&storage_var., &var_name., "G");

将要求您使用要创建的宏变量的名称来对宏进行引用。像这样:

%ExtractACell(dataset=sashelp.cars, storage_var="mymvar", rownum=1, var_name=Make);

使用此语句编写宏可能会更简单。

call symputx("&storage_var", &var_name., "G");

然后您可以在宏变量名周围不加引号的情况下调用:

%ExtractACell(dataset=sashelp.cars, storage_var=mymvar, rownum=1, var_name=Make);

PS如果您需要该宏,则整个过程可能会混乱。