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