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Diagramme bifurcation
One way that I know is to obtain a Poincare section of the flow on an appropriate plane. This can be done by solving the system of differential equations numerically, and obtaining points in the solution that intersect the Poincare plane. This can be done approximately in Matlab, because the numerical solution is of variable time-step, and we cannot get the exact point of intersection... But, perhaps, that is how numerical methods are!