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