getVals() returns the computed function values. getnVals() is the number of values among those returned by getnVals() that can be considered accurate.

• nVals < 0: An argument is out of range. For example, nb <= 0, alpha < 0 or > 1, or x is too large. In this case, b(0) is set to zero, the remainder of the b-vector is not calculated, and nVals is set to MIN(nb,0) - 1 so that nVals != nb.
• nb > nVals > 0: Not all requested function values could be calculated accurately. This usually occurs because nb is much larger than abs(x). In this case, b(n) is calculated to the desired accuracy for n < nVals, but precision is lost for nVals < n <= nb. If b(n) does not vanish for n > nVals (because it is too small to be represented), and b(n)/b(nVals) = \(10^{-k}\), then only the first NSIG-k significant figures of b(n) can be trusted.