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Decay rate

  1. Nov 6, 2015 #1
    Hi everyone
    I have a system of ODE as follows

    f1,2,3(t) are unknown nonlinear functions of time, a is constant and unknown, x1,2,3 and their derivatives are given. How can I estimate the parameter a from the given information?
  2. jcsd
  3. Nov 6, 2015 #2


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    It's not clear what information you are given, besides the form of the equations. Do you have some initial values given which occur at a certain time t ?
  4. Nov 6, 2015 #3
    Thanks for your reply. Yes, I know x1(0)=x2(0)=x3(0)=1
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