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NTHL
By default, the pseudo-arclength stepsize includes all state variables
(or state functions) and all free parameters.
Under certain circumstances one may want to modify the weight accorded
to individual parameters in the definition of stepsize.
For this purpose, NTHL defines the number of parameters whose weight
is to be modified.
If NTHL=0 then all weights will have default value 1.0 .
If NTHL0 then one must enter NTHL pairs,
Parameter Index Weight ,
with each pair on a separate line.
For example, for the computation of periodic solutions it is
recommended that the period not be included in the pseudo-arclength
continuation stepsize, in order to avoid period-induced limitations
on the stepsize near orbits of infinite period.
This exclusion can be accomplished by setting NTHL=1, with,
on a separate line, the pair 11 0.0 .
Most demos that compute periodic solutions use this option;
see for example demo ab.
Gabriel Lord
2007-11-19