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Homework Help: Solving for a fixed point for a sine map

  1. Feb 5, 2010 #1
    1. The problem statement, all variables and given/known data
    Consider the sine map x{sub t+1} = f(x{sub t}) where f(x) = r*sin(x*pi).

    For r > 1/pi there are two fixed points, one at the origin that is unstable, and one elsewhere on the curve. The non-origin fixed point starts out, as you turn r just slightly above 1/pi, as stable, but at some point becomes unstable.

    I want to find the value of r at which the second fixed point becomes unstable.

    2. Relevant equations

    3. The attempt at a solution

    To do that, I need to solve x = r*sin(x*pi) for x. How can I do that, or, how else can I find, numerically, the value of r at which the second fixed point becomes unstable?
  2. jcsd
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