Encapsulates the results returned by
BesselJ.rjBesl(double, double, int).
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.