我需要在我的数据步骤中循环一些宏变量我试图定义宏变量并在数据步骤中动态构建它们,就像这样
DATA _NULL_;
call symputx('_rbank_1',put(001,z3.));
call symputx('_rwebhost_1','company1.myhost.com');
call symputx('_rbank_2',put(008,z3.));
call symputx('_rwebhost_2','company2.myhost.com');
call symputx('_rbank_3',put(008,z3.));
call symputx('_rwebhost_3','company3.myhost.com');
RUN;
%let _rbank_1 = &_rbank_1;
%let _rwebhost_1 = &_rwebhost_1;
%let _rbank_2 = &_rbank_2;
%let _rwebhost_2 = &_rwebhost_2;
%let _rbank_3 = &_rbank_3;
%let _rwebhost_3 = &_rwebhost_3;
data test;
do cnt=1 to 3;
macroString=compress("&_rwebhost_"||cnt);
marcroValue=macroString;
end;
run;
但是macroValue的输出是“&_rwebhost_3”,我需要它是值而不是名称。
我可以在宏中执行此操作,但我确实需要它在数据步骤中。通常在其他编程语言中我会定义一个哈希表,但在sas datastep中似乎并不那么简单。
同情的对话是symget
data test;
do cnt=1 to 3;
macroString=symgetc(cats("_rwebhost_",put(cnt,BEST32.)));
marcroValue=symgetn(cats("_rbank_",put(cnt,BEST32.)));
output;
end;
run;
使用SYMGET()函数检索名称未提前知道的宏变量的值。
%let _rbank_1 = 001;
%let _rwebhost_1 = company1.myhost.com;
%let _rbank_2 = 008;
%let _rwebhost_2 = company2.myhost.com;
%let _rbank_3 = 008;
%let _rwebhost_3 = company3.myhost.com;
data test;
do cnt=1 to 3;
bank = symget(cats('_rbank_',cnt));
webhost= symget(cats('_rwebhost_',cnt));
put cnt= bank= webhost= ;
end;
run;
但是,如果需要数据集变量中的值,则将它们存储在数据集中而不是宏变量中。例如,您可以使用SET语句中的POINT =选项来选择要读取的观察值。
data company ;
input bank $3. webhost $20. ;
cards;
001 company1.myhost.com
008 company2.myhost.com
008 company3.myhost.com
;
data test;
do cnt=1 to 3;
set company point=cnt;
put cnt= bank= webhost= ;
end;
run;