Next: Using pplane2d.m
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This represents the system associated with the 2nd
order, nonlinear, homogeneous ODE with constant coefficients that
describes the motion of a damped pendulum.
The linearization of this system is accomplished via the four
evaluated at any critical point
Once the linearization has been formed, we use cclin.m with
to investigate stability about each .
The symbolicplot option `eigenvals' is useful only for