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MathGroup Archive 2006

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Re: General--Differential equation problem..

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66353] Re: General--Differential equation problem..
  • From: Heinz Spindler <heinz at mathematik.Uni-Osnabrueck.DE>
  • Date: Wed, 10 May 2006 06:34:26 -0400 (EDT)
  • Organization: Universitaet Hannover
  • References: <e3jttb$94n$1@smc.vnet.net>
  • Reply-to: Heinz.Spindler at mathematik.Uni-Osnabrueck.DE
  • Sender: owner-wri-mathgroup at wolfram.com

randomtalk at gmail.com wrote:

>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]]
>
>
>Try this:
>
DSolve[{x'[s]==Cos[z[s]],y'[s]==]Sin[z[s]],z'[s]==1/2},{x[s],
    y[s],z[s]},s]


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