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  • MATHEMATICA and RIGID BODY MODELLING

    Hello! I am using Mathematica to analyse rigid body models of human motion.
    Unfortunately, I am unable to use Mathematica to do a numerical integration
    of a system of ODE's until a specified function of the solution is zero.
    (i.e. I need a function that can numerically integrate a system of first
    order ordinary differential equations over a range with suitable initial
    conditions, until a user-specified function, if supplied, of the solution
    is zero). Can you please tell me whether Mathematica has the capacity to do
    this in some way - or are there Mathematica packages that can do this? All
    I can find is NDSolve.

    The importance of being able to do this is paramount. For instance, if
    modelling throwing action, there comes a point in time when the elbow
    locks, and the arm is straight. I need to able to determine this point in
    order to continue the solution for when the arm begins to flex.

    Looking forward to your help.

    Regards

    Rene Ferdinands
    Department of Physics
    University of Waikato
    New Zealand
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