Re: A question of simplification
- To: mathgroup at smc.vnet.net
- Subject: [mg21007] Re: [mg20953] A question of simplification
- From: "David Park" <djmp at earthlink.net>
- Date: Thu, 2 Dec 1999 21:41:20 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
>In Mathematica, when using partial differentiation, we get
>D[c.f[x]]=0.f[x]+c.f'[x], not c.f'[x]. So, when the equation is long,
>the result will be very tedious.
>How can I simply the result to c.f'[x]? I have tested Simplify and
>FullSimplify. It does not work.
>Please help me! Thanks!
>
>Green
D[c.f[x], x]
% /. {0 ._ -> 0, _.0 -> 0}
0.f[x] + c.f'[x]
c.f'[x]
Don't forget the space between the 0 and the . in the rule.
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/