ISW

This constant controls branch switching at branch points for the case of differential equations. Note that branch switching is automatic for algebraic equations.

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ISW=1 : This is the normal value of ISW.

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ISW=$-$1 : If IRS is the label of a branch point or a period-doubling bifurcation then branch switching will be done. For period doubling bifurcations it is recommended that NTST be increased. For examples see Run 2 and Run 3 of demo lor, where branch switching is done at period-doubling bifurcations, and Run 2 and Run 3 of demo bvp, where branch switching is done at a transcritical branch point.

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ISW=2 : If IRS is the label of a fold, a Hopf bifurcation point, or a period-doubling or torus bifurcation then a locus of such points will be computed. An additional free parameter must be specified for such continuations; see also Section 10.7.