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From: edp@jareth.enet.dec.com (Eric Postpischil (Always mount a scratch monkey.))
Newsgroups: comp.sys.handhelds
Subject: Re: Bug in HP 28S
Message-ID: <22245@shlump.nac.dec.com>
Date: 22 Apr 91 12:49:09 GMT
References: <1991Apr19.210456.25235@leland.Stanford.EDU>
Sender: newsdaemon@shlump.nac.dec.com
Reply-To: edp@jareth.enet.dec.com (Eric Postpischil (Always mount a scratch monkey.))
Organization: Digital Equipment Corporation
Lines: 29

In article <1991Apr19.210456.25235@leland.Stanford.EDU>,
polly@leland.Stanford.EDU (polly siegel) writes:

>When I enter an equation, many times the variables that show up
>in the SOLVR menu are not the variables that I entered in my equation, and
>so I can't solve my equation.  I have to play around with variable names until
>I get some that it will accept.

My guess is that the variables that aren't appearing in the menu are
defined in some directory in your current path.  The Solver starts with
ALL the variables that appear in your equation.  Then it checks each
variable.  If the variable is not defined or is a number, it is put in
the menu.  If the variable is an algebraic, then the Solver does not put
that variable in the menu, but gets all the variables from that
algebraic and adds them to the list it is working on.

So if you have an equation '2*X=3*Y+Z' and in some directory in your
current path there is an object named 'X' that is defined as 'A-B', then
A, B, Y, and Z will appear in the menu.

To test this, when it occurs again, do this:  'EQ' RCL HOME 'EQ' STO. 
Then go into the Solver.  If the variables in EQ still do not appear,
then look for objects with those names in the home directory and purge
them.


				-- edp (Eric Postpischil)
				"Always mount a scratch monkey."
				edp@jareth.enet.dec.com