Re: Sin*Cos + Log
- To: mathgroup at smc.vnet.net
- Subject: [mg113249] Re: Sin*Cos + Log
- From: Sam Takoy <sam.takoy at yahoo.com>
- Date: Wed, 20 Oct 2010 04:09:41 -0400 (EDT)
Dear Bob,
Thanks.
My hope is that I can define f without mentioning the arguments, as in
f = Sin*Cos + Log
It doesn't make much difference in this case, but in my case I have something
along the lines of
f[t_, x_, y_, z_] = g[t, x, y, z]*h[t, x, y, z] + Derivative[0, 0, 1, 0][h][t,
x, y, z] etc
and I'd like to say
f = g*h + Derivative[0, 0, 1, 0][h]
skipping the arguments.
Is that possible?
Thanks!
Sam
________________________________
From: Bob Hanlon <hanlonr at cox.net>
To: Sam Takoy <sam.takoy at yahoo.com>; mathgroup at smc.vnet.net
Sent: Tue, October 19, 2010 7:20:45 AM
Subject: [mg113249] Re: [mg113215] Sin*Cos + Log
f[x_?NumericQ] := Sin[x]*Cos[x] + Log[x]
f /@ {x, 2, 2.}
{f[x], Log[2] + Cos[2] Sin[2], 0.314746}
x /: NumericQ[x] = True;
f /@ {x, y}
{Log[x] + Cos[x] Sin[x], f[y]}
Bob Hanlon
---- Sam Takoy <sam.takoy at yahoo.com> wrote:
=============
Hi,
I'm working on a project that involves manipulating lots of functions.
It would be much easier if I could manipulate functions without
evaluating them and then evaluate them at the end. To this end, is there
a way to endow
f = Sin*Cos + Log
with meaning and then somehow evaluate
f[x]?
Many thanks in advance,
Sam