How do I get a DSolve'd function

*To*: mathgroup at smc.vnet.net*Subject*: [mg54384] How do I get a DSolve'd function*From*: skirmantas.janusonis at yale.edu (Skirmantas)*Date*: Sat, 19 Feb 2005 02:33:01 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

I hope this is the last question for now. I can solve a differential equation and plot it by doing something like this: sol=DSolve[{f'[x]==-3f[x],f[0]==10},f,x] Plot[f/.sol,{x,0,10}] But how do I get the function f[x] itself? I want to be able to input f[x] and get its definition. Or do Plot[f[x],{x,0,10}]. Or define y[x_]:=f[x]^2. f[x]/.sol or f[x_]:=f[x]/.sol or f[x_]:=sol[[n,n,n]] do not work. What if the solution is a function with many variables, say u[x,y,z]? What's the correct way to "get" it?

**Follow-Ups**:**Re: How do I get a DSolve'd function***From:*DrBob <drbob@bigfoot.com>

**Re: How do I get a DSolve'd function***From:*Chris Chiasson <chris.chiasson@gmail.com>