[Numpy-discussion] Definitions of pv, fv, nper, pmt, and rate

[d_l_goldsmith at yahoo.com]

Hi, folks.  Unable to find a printed reference for the definition we use to compute the functions in the Subject line of this email, I posted a couple queries for help in this regard in the Discussion for fv
(http://docs.scipy.org/numpy/docs/numpy.lib.financial.fv/#discussion-sec).  josef Pktd's reply (thanks!) just makes me even more doubtful that we're using the definition that most users from the financial community would be expecting.  At this point, I have to say, I'm very concerned that our implementation for these is "wrong" (or at least inconsistent with what's used in financial circles); if you know of a reference - less ephemeral than a solely electronic document - defining these functions as we've implemented them, please share.  Thanks!

David Goldsmith

PS: Some of the financial functions' help doc says they're unimplemented - are there plans to implement them, and if not, why do we have help doc for them?