RE: differential equation solve

*To*: mathgroup at smc.vnet.net*Subject*: [mg68834] RE: [mg68821] differential equation solve*From*: "David Park" <djmp at earthlink.net>*Date*: Mon, 21 Aug 2006 03:27:27 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

You didn't give a sample input statement for the case where you got the first error message. Post that and you will obtain a better answer. As for the latter two equations, they both returned solutions on my systems, one with a warning message. You didn't show the output that you got. Maybe you could state the problem more clearly with both input and output? David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: elvis [mailto:rapstone at gmail.com] To: mathgroup at smc.vnet.net 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!