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Thread: Simple Differiential equation, just finding a constant C problem .:Resolved:.

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    Hyperactive Member voidflux's Avatar
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    Simple Differiential equation, just finding a constant C problem .:Resolved:.

    Hello everyone, I'm close to the solution but i just got hung up on some sort of algebra mistake i think.....

    I'm solving a Logistics Equation, dealing with population growth/decay
    All i have to do is use P(0) = Po to get C2 and then it will be solved.
    Po stands for P sub o. not P*0.

    I have

    Code:
    P/(M-P) = C2 e^(mkt)
    note: C2 is just a constant C, u get when u integrate.
    M and k are constants.

    I now the solution is:
    Code:
    P(t) = MPo/[Po + (M-Po)*e^(-kmt)]


    Here is what I did,
    Code:
    P/(M-P) = C2*e^(mkt)
    P = C2*e^(mkt) (M-P)
    now I used P(0) = Po;
    Po = C2*e^(mk(0)) (M-P)
    C2 = Po/(M-P);
    Then i plugged C2 back into the orginal equation and I got
    P/(M-P) = [Po/(M-P)]*e^(mkt);
    which looks nothing like the solution...any ideas where I messed up?

    Thanks for listening!
    Last edited by voidflux; Sep 23rd, 2004 at 09:33 AM.
    C¤ry Sanchez
    Computer Science/Engineering
    @ Penn State
    IBM.zSeries Intern
    Mandriva 2007

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