Date:         Mon, 6 Dec 1999 11:59:43 -0600
Reply-To:     JGerstle@SW.UA.EDU
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         JGerstle@SW.UA.EDU
Subject:      CrossProduct Array question
Content-type: text/plain; charset=US-ASCII

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