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>