Re: differential equation solve
- To: mathgroup at smc.vnet.net
- Subject: [mg68862] Re: [mg68821] differential equation solve
- From: "Chris Chiasson" <chris at chiasson.name>
- Date: Mon, 21 Aug 2006 03:28:30 -0400 (EDT)
- References: <200608200843.EAA04364@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
You must have a definition for y or another variable already assigned
in the same session.
Clear[x,y,r,a]; then solve the equation.
On 8/20/06, elvis <rapstone at gmail.com> 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]
>
> another equation:
>
> \!\(DSolve[{\(x'\)[t] == r*x[t] \((1 - x[t]\/xm)\), x[0] == x0}, x,
> t]\)
>
> this face anothe prolbem
>
> Can anyone help to "solve" this problem for me?
> Thanks!
>
>
--
http://chris.chiasson.name/
- References:
- differential equation solve
- From: "elvis" <rapstone@gmail.com>
- differential equation solve