I would like to do another one for the inverse function and one for the derivative.
In an engineering application it's generally more about relative error instead of absolute error.
1. Relative/absolute errors apply strictly to fitted data set(S).
relative error is a useless curiosity.
relative error of my fitted thermocouples [J, T] is purely idiotic.
2. maple can generally render ... if so, derivative as well.
If maple is not willing, we have seeded scanner code
Jean