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MathGroup Archive 2006

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Re: General--Differential equation problem..

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66300] Re: General--Differential equation problem..
  • From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
  • Date: Mon, 8 May 2006 00:46:51 -0400 (EDT)
  • References: <e3jttb$94n$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

This works:

DSolve[{Derivative[1][x][s] == Cos[z[s]], Derivative[1][y][s] == Sin[z[s]],
   Derivative[1][z][s] == 1/2}, {x, y, z}, s]


Steve Luttrell
West Malvern, UK

<randomtalk at gmail.com> wrote in message news:e3jttb$94n$1 at smc.vnet.net...
> hello, i was trying to solve a set of differential equations needed for a 
> school project.. However, i'm completely new to mathematica 5.0, and i 
> have downloaded trial, here is what i inputed into the software:
>
> In[2]:=
> DSolve[{x'[s] == Cos[z], y'[s] == Sin[z], z'[s] == 1/r, r == 2}, {x, y, 
> z}, s]
>
> returns this error: DSolve::dvnoarg: The function z appears with no 
> arguments.
>
> Is there anything wrong with what i inputed? The differential equations 
> came from this website: http://fy.chalmers.se/LISEBERG/eng/loop_pe.html
>
> Link to the forum page for this post:
> http://www.mathematica-users.org/webMathematica/wiki/wiki.jsp?pageName=Special:Forum_ViewTopic&pid=10212#p10212
> Posted through http://www.mathematica-users.org [[postId=10212]]
>
> 



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