Is the a bioAtan function?

[Jeppe Rich]

I think not? I need it for a non-linear specification.

I've tried to make a class, but could not get it to work.

Any chance the Atan can be implemented (-:

/J

[Michel Bierlaire]

Hi Jeppe.
Strange request ;-)
I may do it in a future version. Meanwhile, using a Taylor's expansion is probably the best solution.
Michel

> --
> You received this message because you are subscribed to the Google Groups "Biogeme" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to biogeme+u...@googlegroups.com.
> To view this discussion visit https://groups.google.com/d/msgid/biogeme/2d4cd8b4-6695-459f-97fa-b4bcfab234f3n%40googlegroups.com.

Michel Bierlaire
Transport and Mobility Laboratory
School of Architecture, Civil and Environmental Engineering
EPFL - Ecole Polytechnique Fédérale de Lausanne
http://transp-or.epfl.ch
http://people.epfl.ch/michel.bierlaire

[Jeppe Rich]

I know (-: it's for some weird functional stuff I'm working on. It is just that;

 

t <- 2/pi *atan(1/w)
 

Is a nice transfer function that I'm using. Maps to the unit interval. But so far I solved using fitted variant as you propose.

I'll manage!

/J