Re: How do I get a DSolve'd function

• To: mathgroup at smc.vnet.net
• Subject: [mg54432] Re: How do I get a DSolve'd function
• Date: Sun, 20 Feb 2005 00:09:55 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```On 2/19/05 at 2:33 AM, skirmantas.janusonis at yale.edu (Skirmantas)
wrote:

>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.

sol = DSolve[{Derivative[1][f][x]== -3*f[x], f[0] == 10}, f, x];
y = f /. First[sol];

y[x]
10/E^(3*x)

y[x]^2
100/E^(6*x)
--
To reply via email subtract one hundred and four

```

• Prev by Date: Re: Question about an integral
• Next by Date: Re: Replace in recursive equations
• Previous by thread: Re: How do I get a DSolve'd function
• Next by thread: Re: How do I get a DSolve'd function