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Math Help - "Two-eyed monster" phase plane?

  1. #1
    Junior Member
    Joined
    Oct 2006
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    "Two-eyed monster" phase portrait?

    I'm supposed to use a computer to graph the phase portrait of the following system.

    x'=y+y^2
    y'=(-1/2)x+(1/5)y-xy+(6/5)y^2

    The only problem is that I'm not good with math related computer programs. I don't know how to graph this phase portrait. I call it the "two eyed monster" because this system is apparently from a Borrelli and Coleman 1987 textbook p.385 and the phase portrait looks like a two eyed monster.

    Can someone who is good with math computer programs graph this for me? Thanks a lot.
    Last edited by splash; November 2nd 2006 at 01:45 PM.
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