Re: DSolve Not Working
- To: mathgroup at smc.vnet.net
- Subject: [mg44960] Re: DSolve Not Working
- From: adam.smith at hillsdale.edu (Adam Smith)
- Date: Thu, 11 Dec 2003 05:28:06 -0500 (EST)
- References: <br4254$j1n$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
You need a space or a multiplication sign "*" between the a and y'[x] in the term "ay'[x]". Mathematica interprets the ay'[x] as a derivative of a variable named "ay". Adam Smith Will Oram <spamguy at NOSPAM.foxchange.NOSPAM.com> wrote in message news:<br4254$j1n$1 at smc.vnet.net>... > I'm using Mathematica 5; DSolve[] never works. I am literally copying from > its own documentation, and it still spits out failures. For example: > > In: DSolve[y''[x]==ay'[x]+y[x],y,x] > DSolve::dvnoarg: The function y appears with no arguments > Out: DSolve[y''[x]==(ay)/x+y[x],y,x] > > Wha?