Support nthRoot((-8), (3/2))

[sonnyk22]

The library works fantastic when in providing the correct result of 4 for (-8)^(2/3), but it does not return the the same result when nthRoot(-8, 3/2) or nthRoot((-8), (3/2)); it returns Error: Root must be odd when a is negative error message. I am getting 4returning from the TI on this as well. I am using the numbersetting in the config()function. Is there an extra setting that I am missing?

[josdejong]

Thanks for reporting. The algorithm used to calculate nthRoot has limitations, would be nice if we could improve this.