Date:         Wed, 3 Oct 2007 12:05:33 -0400
Reply-To:     Jean-Jacques Dubois <jjbdubois@MINDSPRING.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Jean-Jacques Dubois <jjbdubois@MINDSPRING.COM>
Subject:      Specify HREF values from a variable, with BY-processing

Hello all,

I am producing a slew of graph using some BY-groups of interest, and for
each of those graphs, I would like to display a reference line at the value
of some  other variable.
The following sample:
<http://support.sas.com/ctx/samples/index.jsp?sid=396&tab=code> shows how to
accomplish this for a single graph. How could this be accomplished when BY
processing is present?

More details: 1) the by-group is defined by multiple variables, as in:
proc gplot;by z1 z2 z3;
plot y*x;
run;

and 2) the value of the variable that supplies the reference line is
constant for each by-group, as in:
data one;
  input x y z1 ref;
  datalines;
1  2 A 6.3
2  4 A 6.3
3  5 A 6.3
4  3 A 6.3
5  2 A 6.3
6  4 A 6.3
7  6 A 6.3
8  2 A 6.3
9  2 A 6.3
10 5 A 6.3
1  3 B 5.2
2  5 B 5.2
3  7 B 5.2
4  2 B 5.2
5  2 B 5.2
6  5 B 5.2
7  3 B 5.2
8  3 B 5.2
9  7 B 5.2
10 6 B 5.2
;

I have thought of a workaround, where the vertical reference line would be
created using an axis definition and an overlaid plot of y1*x, with the
value y1 taking on 2 values at the minimum and maximum of the axis range,
and the corresponding x set at the relevant value. But I am sure that there
must be a more elegant solution.

Thank you for weighing in

Jean-Jacques