Marvellous. A couple of small suggestions?

[g40]

Would be very handy to

a) have the error factors printed out in the code
b) be able to create a generated function name from range and a command line argument i.e. pow_64_127
c) be able to specify a list of ranges as in -r 1:64 -r 65:128 ...

I can send a PR when I get around to the above if you wish.

I am using the outputs to generate a (much) more compact form for a lookup table. Saves a massive number of cycles not having to index and interpolate with some 3rd order equation!

Invaluable. Thanks again.

[samhocevar]

Thanks for the suggestions, I am glad the software is useful!

a) and b) make sense to me and I’ll welcome any PR, but c) smells of feature creep to me and I believe that users can do several runs from inside a script instead.