Date:         Mon, 31 Mar 2003 19:01:07 +0100
Reply-To:     Dwight Eggers <deggers@OPERAMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Dwight Eggers <deggers@OPERAMAIL.COM>
Subject:      macro resolution issue?
Content-Type: text/plain; charset="iso-8859-1"

    I need some help with a tricky (for me) macro
resolution issue.  I am writing a macro with a variable
number of positional parameters -- LIST1, LIST2, ...
LISTn, ... -- where the parameters are passed by-name
rather than by-value.  I want to access one element of the
value associated with a parameter by a %SCAN function.  For
example,

  %let ALIST=%str(AAA BBB CCC);
  %let BLIST=%str(111 222 333);
  %let CLIST=%str(A1 B2 C3);
  %mymacro (ALIST, BLIST, CLIST);

where MYMACRO is defined as

  %macro mymacro (LIST1, LIST2, LIST3, LIST4, ...) / parmbuff ;

I want to access elements of the lists associated with the
parameters with something like a

  %do j=1 %to 3;
    %do i=1 %to &nparms;
      %scan(???LIST&i, &j)
      %end;
    %end;

where ??? represents the sequence of &'s or the quoting
function that I need.  Local variable NPARMS is determined
from the SYSPBUFF variable.  In the first pass of the macro
resolution, I want the &i to be resolved.  In the second
pass, I want the &LISTn to be resolved.  Then finally in
the third pass, the %scan function would be applied to the
appropriate list.  For the variable settings I gave above,
this pair of nested %do loops would resolve to

  AAA
  111
  A1
  BBB
  222
  B2
  CCC
  333
  C3

I am uncertain what combination of &'s and quoting
function(s) I should be using to get this %scan step to
resolve properly.

Thanks,
Dwight Eggers


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