_all_应该怎么查看和使用？

若水烟寒 发表于 2012-11-11 16:09
Thank you very much! But I don't understand why I can't use functions like dim() in the macro loop ...

No, u r wrong!  Functions like dim() can be definitely used in the macro loop "%do %to %end", but only inside the data step. Besides, the macro loop "%do %to %end" is not permitted to used inside the data loop, but outside.

davil2000 发表于 2012-11-11 16:23
No, u r wrong!  Functions like dim() can be definitely used in the macro loop "%do %to %end", but  ...

really?

davil2000 发表于 2012-11-11 16:23
No, u r wrong!  Functions like dim() can be definitely used in the macro loop "%do %to %end", but  ...

er...But in the following example, isn't the "%do %to %end" used in the data step "data temp"? It seems it works well in the sas...

data temp;
input x1-x10;
datalines;
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
;
run;
%macro name;
data temp;
set temp;
%do i=1 %to 10;
rename x&i=w&i;
%end;
run;
%mend name;
%name;
proc print data=temp;
run;

若水烟寒 发表于 2012-11-11 16:33
er...But in the following example, isn't the "%do %to %end" used in the data step "data temp"? It  ...

sorry! I have make a mistake in the expression.  The macro loop will disappear  after compilatin.
For example, there exists such a macro
%macro name;
data temp2;
set temp1;
%do i=1 %to 2;
rename x&i=w&i;
%put x&i;
%end;
run;
%mend name;

After compilation , it will  become

data temp2;
set temp1;
rename x1=w1;
rename x2=w2;
run;

so you can't use functions such as dim() in the macro loop.

davil2000 发表于 2012-11-11 16:47
so you can't use functions such as dim() in the macro loop.

Oh, Thank you very much!~~I think I have a long way to go in the sas study....

thanks thanks thanks