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Math Help - Solve DE using Runge-Kutta

  1. #1
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    Solve DE using Runge-Kutta

    Solve the following equation numerically:

    du/dx = [1-(0.1u/x^2)]/[-3-(0.1u/x^2)-(0.1v/x^2)]
    (where u, v, and x are mass fraction abundances).

    I'm put off by the presence of the v in the denominator. I'm familiar with u'=f(u,x), but now that u' = f(u,x,v), I'm not sure how to go about it.

    Any advice would be appreciated,
    thanks in advance,
    avfc88
    Last edited by CaptainBlack; September 21st 2010 at 01:15 AM.
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