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Compute generalised second order Stirling numbers

Project description


Compute generalised second order Stirling numbers via `libstb

`libstb <>`_ "contains library routines that
provide alternative ways of computing generalised second order Stirling numbers
used in working with Pitman-Yor and Dirichlet processes (PYP and DP)."
`libstb <>`_ is written by Wray Buntine.


An instance of the class ``STable`` provides access to (pre-calculated)
generalized Stirling numbers of the second kind, :math:`S^n_{m,a}`. Initialize
the table with the maximum ``n`` and maximum ``m`` which will be needed.

>>> import pystb
>>> stable = pystb.STable(10000, 10000, 0.5)
>>> stable.S(5, 3) # S^5_{3, 0.5}
>>> stable[5, 3] # alias for stable.S(5, 3)

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