topic Re: array inside macro in SAS Programming

array inside macro

Xiaoningdemao — Fri, 05 Aug 2016 21:58:17 GMT

Dear All,

I want to count the number of observations in each row that satisfiy a certain condition. I want o repreat this procedure for many data set so I'm using macro, but I have problem with using array inside marco. I attached a sample data set and the code I wrote.

Thank you in advance!!!

Best wishes.

data varselect1;

input variable1 variable2 variable3;

cards;

15 20 17

15 18 46

4 5 7

9 40 46

;

run;

%let J=3

%macro count;

%do j=1 %to &J;

data count&j;

set varselect&j;

array a{*} _numeric_;

lt15 = 0;

%do _n_=1 %to 3;

%if a{_n_} lt 15 %then lt15+1;

%end;

run;

%end;

%mend count;

%count

;

Re: array inside macro

Reeza — Fri, 05 Aug 2016 22:14:45 GMT

If you're in a data step don't use a macro do loop , use a data step do loop, ie no %

Re: array inside macro

Xiaoningdemao — Fri, 05 Aug 2016 22:23:25 GMT

Dear Reeza,

OK! I see, thank you very much!
Another issue with this code is that, I set J=3 at the beginning, but it kept saying
' File WORK.VARSELECT4.DATA does not exis
',
and each time I ran the code, J seems to be increase by 1. How did this happen?

Thanks again!

Best wishes.

Re: array inside macro

Reeza — Fri, 05 Aug 2016 22:31:00 GMT

You're using the same macro variable twice, as a counter and loop end.

%let j=3;

%do j=1 %to &j

The macro DO loop creates a new macro J variable. I would definely expect unexpected behaviour with this type of coding. Using a different macro variable will help resolve this issue.

%let end_loop=3;

%do j=1 %to &end_loop

Re: array inside macro

Xiaoningdemao — Fri, 05 Aug 2016 22:38:05 GMT

Oh!! SAS doesn't distinguish upper and lower case!! I was a R user, this is how I would code in R......
Thanks again!! and have a nice weekend~~
Best wishes.

Re: array inside macro

Reeza — Fri, 05 Aug 2016 22:41:06 GMT

No, case only matters in working with character variables.

Re: array inside macro

Xiaoningdemao — Fri, 05 Aug 2016 22:47:27 GMT

Oh~~ That's right.