Multivariate functions

[TomDeRybel]

Hello,

I'm trying to fit a multivariate function. While I've had success with PolyRat, implementing the resulting fit in embedded code is rather ... complex. (And using a rational function converted from that unfortunately fails hard in numerical instability.)

After some digging, it seems that the baricentric formulae used in BaryRat are much more friendly to have a go at, while still offering (hopefully) enough numerical stability.

Q: May I ask if it is possible to do such a thing with BaryRat? And if so, how?

Q: The function I'm working with takes 2 real-valued inputs, for one output. Could it perhaps be possible to treat the inputs as a complex number and fit that?

Thank you,
Tom