[Date Index]
[Thread Index]
[Author Index]
Re: Use of Mathematica with Rulebased Equation Derivations
 To: mathgroup at smc.vnet.net
 Subject: [mg61927] Re: Use of Mathematica with Rulebased Equation Derivations
 From: "JensPeer Kuska" <kuska at informatik.unileipzig.de>
 Date: Sat, 5 Nov 2005 01:52:09 0500 (EST)
 Sender: ownerwrimathgroup at wolfram.com
Hi,
set up a global list of your constants and check the symbol if it is a
member of that list.
Regards
Jens
<mmorriss at gcn.ou.edu> schrieb im Newsbeitrag
news:dkfd8o$etv$1 at smc.vnet.net...
 Hi All  I'm a manyyear user of mathematica,
but have always had one
 particular problem with it that I may have just
simply missed reading
 about.

 Mathematica Version: 5.2

 Problem: I would like to develop a set of
rerewite rules to apply to the
 Expected Value operator. For example:

 E[a x] = a E[x] a > constant, x > variable
 E[b + f[x]] = b + E[f[x]] , etc.

 The issue is how does one using Mathematica
distinguish a 'constant
 variable (i.e. a and b)' from a variable
'variable' (i.e. 'x')? The head
 of a, b and x is 'Symbol' and neither a, b nor x
contain a number so I
 can't use a_?NumberQ to identify it as a
constant.

 This actually goes to the wider question of how
does one use Mathematica
 for symbolic derviations where numbers are not
actually substituted in the
 derviation?

 E.g. E[a + E[b x]] /. Rule2
 out= a + b E[x] etc.

 Thanks all  Mark Morrissey
 University of Oklahoma


Prev by Date:
Re: list of options in Plot
Next by Date:
Re: How was this typed?
Previous by thread:
Re: Re: Re: Use of Mathematica with Rulebased Equation Derivations
Next by thread:
Re: Use of Mathematica with Rulebased Equation Derivations
 