Re: variables versus functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg28803] Re: variables versus functions*From*: "Paul Lutus" <nospam at nosite.com>*Date*: Mon, 14 May 2001 01:32:55 -0400 (EDT)*References*: <9dld6m$o9g@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

"Julian Sweet" <jsweet at engineering.ucsb.edu> wrote in message news:9dld6m$o9g at smc.vnet.net... > How is it different to define a variable such as A=Cos[x] > versus a function A[x_]:=Cos[x] ? In the first case, x must be predefined: a = Cos[x] x = Pi a In the second, x doesn't have to be defined at all outside the function: f[x_] := Cos[x] f[Pi] -- Paul Lutus www.arachnoid.com