MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: General--Differential equation problem..


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]


  • Prev by Date: Re: creating a symbolic square symmetric matrix
  • Next by Date: Re: mirror image of a square matrix
  • Previous by thread: Re: General--Differential equation problem..
  • Next by thread: Save to Quicktime during calculations?