info about missing code

[Turolla Axel]

Dear sirs,

 

In the past I used the following Matlab code, that I cannot find in Octave packages:

 

-          “Trust region reflective least squares” algorithm in “lsqnonlin” function;  in Octave, the lsqnonlin-equivalent (I guess) function “nonlin_residmin” has only Levenberg-Marquardt algorithm (“lm_svd_feasible”) as optimization backend. Unfortunately, such algorithm doesn’t work for my application.

 

-          ode23tb solver for Ordinary Differential Equations. The problem I have to solve has stiff equations and the only stiff solver implemented in Octave is ode23s, but unfortunately it doesn’t work.

 

Are these codes available somewhere? Is it planned to implement such codes in the future?

 

Many thanks.

 

Best regards.

 

Axel

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