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From: jmr@ecl.psu.edu
Newsgroups: comp.sys.handhelds
Subject: Symbolic Derivatives (48-SX)
Message-ID: <1991Feb11.221409.644@ecl.psu.edu>
Date: 12 Feb 91 02:14:09 GMT
Organization: Engineering Computer Lab, Pennsylvania State University
Lines: 16

Anyone out there know how to force the 48sx to return a symbolic derivative?
What I want to do is take the derivative of an algebraic with respect to
'X' (for example), however, 'X' is defined in the current subdirectory
with a numeric value.

When I compute the derivative of some function f(X) with respect to 'X',
rather than a symbolic result, the value of 'X' is substituted in
"automatically".  Unfortunately, this is not what I want.  I need a
symbolic derivative in term of the algebraic 'X'.

The only work around I can figure is to use the "where" function (|) to
substitute in some unused variable for 'X' and then compute the derivative.

I must be overlooking something.  Any ideas?

Joe Reinhardt
jmr@ecl.psu.edu