%do的问题

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我今天发现%do似乎必须要和%to联用。比如：
%macro a;
%do a=1,2,3; /*这样就不行*/
%put &a.;
%end;
%mend;
%a;

%macro a;
%do a=1 %to 3;  /*只能这样*/
%put &a.;
%end;
%mend;
%a;

现实的问题是，如果我想对a取1，3做循环，就比较麻烦了。我目前的解决办法是从1到3做循环，然后进来以后再用%if判断一下。谁有更好的办法？

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关键词：Macro 解决办法 End acr CRO

%macro a;
%do a=1 %to 3 %by 2;
%put &a.;
%end;
%mend;
%a;

这样怎么样啊？我也不清楚macro里面是否一定要把%do和%to合用，不过看log是这么说的

tangliang0905 发表于 2013-1-28 21:58
%macro a;
%do a=1 %to 3 %by 2;
%put &a.;

这样是对的。但是还不是我想要的，满足不了需求。

You can alternative to set up a quote from i to theNumberUWant(i->N_i), say 1->3, 2->5, 3->7...... then use
%do i=1 %to 3;
       %put &&N_&i.;
%end;

xiaodanzi 发表于 2013-1-29 09:35
You can alternative to set up a quote from i to theNumberUWant(i->N_i), say 1->3, 2->5, 3->7...... t ...

Yes, it is. It also a way I used to solve the problem, and it works. However, I think it is also a little troublesom and try to find a better way.

xiaodanzi 发表于 2013-1-29 09:35
You can alternative to set up a quote from i to theNumberUWant(i->N_i), say 1->3, 2->5, 3->7...... t ...

Yes, it is. It also a way I used to solve the problem, and it works. However, I think it is also a little troublesom and try to find a better way.

xiaodanzi 发表于 2013-1-29 09:35
You can alternative to set up a quote from i to theNumberUWant(i->N_i), say 1->3, 2->5, 3->7...... t ...

Yes, it is. It also a way I used to solve the problem, and it works. However, I think it is also a little troublesom and try to find a better way.

Try the following, let me know any concerns.

%macro looptest / parmbuff;
%let loopindex=1;
%do %until (%scan(&syspbuff,&loopindex) eq );
        %let loopnum=%scan(&syspbuff,&loopindex);
        %if &loopnum ne %then
                %put &loopnum;
        %else
                %put ***Wrong!!!***;
        %let loopindex=%eval(&loopindex+1);
%end;
%mend;

%looptest(3 5 10)

bjtoronto 发表于 2013-1-29 22:47
Try the following, let me know any concerns.

%macro looptest / parmbuff;

用loopnum做所列宏的指标，然后学习想到用%scan函数，精彩！
/ parmbuff 和 &syspbuff 也是我以前没用过的，学习了不少！ 谢谢