SAS：在宏程序的循环中使用动态宏变量

Question

我想达到同样的效果：

data train_Sex(keep=Name Sex) train_Age(keep=Name Age) train_Height(keep=Name Height) train_Weight(keep=Name Height);
    set sashelp.class;
run;

使用带有变量列表的宏程序。据我所知：

* Build macro program;
%macro build_sets(var_list);
    %let nwords = %sysfunc(countw(&var_list));

    %do i=1 %to &nwords;
        call symput("variable",  %scan(&var_list, i));

        data train_&variable(keep=Name &variable);
            set sashelp.class;
        run;

    %end;
%mend;

* Run it;
%let var_list = Sex Age Height Weight;
%build_sets(&var_list);

但我不知道如何动态更改 "variable" var.

谢谢！

类似问题：

1.SAS dynamically declaring macro variable 2. Using a dynamic macro variable in a call symput statement 3.

Answer 1

你很接近。下面的东西应该适合你。调用 symput 是 datastep 的一部分，用于从 dvariables 创建宏变量，因此是问题。

 %macro build_sets(var_list);
;

%do i=1 %to  %sysfunc(countw(&var_list));
    %let variable=  %scan(&var_list, &i));

    data train_&variable(keep=Name &variable);
        set sashelp.class;
    run;

%end;
%mend;

 * Run it;
%let var_list = Sex Age Height Weight;
%build_sets(&var_list);

SAS：在宏程序的循环中使用动态宏变量

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