infuriating Series[] question
- To: mathgroup at smc.vnet.net
- Subject: [mg17226] infuriating Series[] question
- From: Peter Jay Salzman <psalzman at landau.ucdavis.edu>
- Date: Mon, 26 Apr 1999 01:20:56 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Dear all,
I'm trying to develop very high order difference equations, and want to use
Mathematica to save me from calculating tons of quantities like 5^10 / 7!
If I define:
g[x_] := Series[ f[x], {x,0,10} ]
And try to compute stuff like:
g[5*h] or g[10*h]
It gives me the right answer, but i get terms like
f'''''[0] * (5 x)^(10) / 10!
The whole point in using Mathematica is so that I don't have to calculate things
which look like 5^10 / 10! (that's factorial, of course, not me being
emphatic).
Even when I try things like // Simplify or // FullSimplify, Mathematica refuses to
simplify these rational coefficients. One thing I've learned is that Mathematica
can do anything -- but figuring out how to do the something is often
completely not obvious to a nominal user like me.
Can someone tell me the secret here?
Pete
--
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