You are on the right track, only thing need is to declare another array:

array prod (43) p1-p43;

Ya Huang Organon Inc.

> -----Original Message----- > From: JGerstle@SW.UA.EDU [mailto:JGerstle@SW.UA.EDU] > Sent: Monday, December 06, 1999 1:00 PM > To: SAS-L@LISTSERV.UGA.EDU > Subject: CrossProduct Array question > > > I have a quick question (SAS 6.12 via Win98). > > I need to determine the products of 43 pairs of variables (i.e. c1*b1 > , c2*b2 , ......etc... c43*b43 ). I was thinking that there > should be > a way to do this without typing out every product as separate lines > in the data step. I'm thinking that if I were to create an array for > both sets of variables that there should be a way to multiply each > pair of variables. I tried it like this but to no avail: > > array seta (43) c1 - c43; > array setb (43) b1 - b43; > do i = 1 to 43; > prod(i) = seta(i)*setb(i); > end; > etc.. > > The message I get is: > ERROR: Undeclared array referenced: PROD. > ERROR: Variable PROD has not been declared as an array. > > What I'd like is to get 43 separate variables calculated form the 43 > products, each with its own name. Should I create a variable for > each step of the array calculations? Can I do this without using > macros? > > > John Gerstle > Program Analyst, Sr. > Applied Gerontology Program > University of Alabama >