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Student Support Forum: 'NDSolve and ODE Matrix Equations' topicStudent Support Forum > General > "NDSolve and ODE Matrix Equations"

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Peter Diehr
12/20/07 12:56pm

I'm working on a 3D pendulum problem with rotation matrices, which reduces to just two equations:

R'[t]=R[t]S[Omega[t]]

and

Omega'[t] = J^-1(J.Omega[t] x Omega[t] + M[t])

where M[t] is an expression involving R[T], J is the constant inertia matrix, and the dynamical variables are Omega[t], a vector, and R[t] a 3x3 matrix.

I would like to enter these expressions directly into NDSolve, but I can't seem to come up with anything that works ... I have to break it down into 12 equations.

Any suggestions would be appreciated.

I'm using version 6.0.1, 32 bit Windows.


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