Referencing other variables in same array

[jpsmith]

Hello expert SAS data management coders,

I have several dichotomous variables indicating the presence of clinical symptoms (i.e. cough, fever, etc) in an array. I would like to know if patients had "only cough," "only fever," etc. I have put some simplified, example code below with what I would like to happen in [brackets].

Hopefully this is a simple question, but if it is complicated, I can look at other routes. But I have had this question in general for a while now and so figured I would go ahead and ask. None of the references I can find on arrays seem to address this specific question.

Thank you in advance for your assistance.

Jonathan

array x {*} cough malnutrition fever lethargy;
array y {*} cough_only malnutrition_only fever_only lethargy_only 
		do i=1 to dim(x);
			if x{i}=1 and [all other variables in the array equal 0] then y{i}=1; 
                        else y{I}=0;
		end; drop i;

[PaigeMiller · Accepted solution]

if x{1}=1 and sum(of x{*})=1 then cough_only=1;
if x{2}=1 and sum(of x{*})=1 then malnutrition_only=1;

Or you could do this in a loop where instead of cough_only=1 you have y{1}=1

[jpsmith]

Perfect - thanks so much! Didn't know about the {*}.