Re: solve differential equation problem
- To: mathgroup at smc.vnet.net
- Subject: [mg68840] Re: solve differential equation problem
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Mon, 21 Aug 2006 03:27:35 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <ec97dc$4b3$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
elvis wrote:
> Here we often use mathematica to solve differential equations, when I
> encouter a equation with several constrains I set them to those values.
> But it cannot solve it and have the following warnings:
>
> DSolve::deqx: Supplied equations are not differential equations of
> the given functions.
>
> Give a very simple differential equation here:
>
> DSolve[{y'[x] == r*y[x], y[0] == a}, y, x]
>
> Can anyone help to "solve" this problem for me?
> Thanks!
>
Some of the symbols y, x, r, a must have been define to some values
before you try to solve your differential equation. Restart the kernel
or start a fresh session and try again. I had no problem on my system:
DSolve[{Derivative[1][y][x] == r*y[x], y[0] == a}, y, x]
--> {{y -> Function[{x}, a*E^(r*x)]}}
HTH,
Jean-Marc