4D Function Approximation

[Stuart Rogers]

I would like to represent a continuous, complex-valued function depending on 4 independent real variables, f(w,x,y,z), defined in a 4D box, for example f: [a1,b1] x  [a2,b2] x  [a3,b3] x  [a4,b4] -> \mathbb{C}. Chebfun only goes up to 3D via Chebfun3. Are there any math toolboxes that might represent such a function?

[Behnam Hashemi]

One option might be https://github.com/cstroessner/EFTT. This is not part of Chebfun though.