[Octave-patch-tracker] [patch #8047] New function for odepkg

[Sebastian]

Follow-up Comment #6, patch #8047 (project octave):

Dear Carlo, 

I had chosen the classical half-step approach because it is robust and easy to
implement (I thought I used Richardson extrapolation? Then it should also be
second order). Anyway, I guess that the difference is negligible and we could
go for odebwenk here without any loss. 

I propose odeset('nlssolver',@function)  as an option for odebwe with fallback
to a private newton scheme. Then we don't need a dependency on optim because
it's the user's responsibility. 

Checking for the package is also fine (I personall check for functions because
I want to keep matlab compatibility). 

Bye
Sebastian

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