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

David Goldsmith d_l_goldsmith at yahoo.com
Thu Jun 11 13:23:53 EDT 2009

Thanks, both for your kind words and for the patch; I don't suppose I could prevail upon you to be Team Lead for doc-ing numpy.finacial?


--- On Thu, 6/11/09, Skipper Seabold <jsseabold at gmail.com> wrote:

> > OK, I concede defeat: if it is the wisdom of the PTB
> that numpy.financial be retained, I will stop messing w/
> their help doc, 'cause I'm clearly in over my head.
> I wouldn't concede defeat just yet.  A few weeks ago I
> didn't even
> know numpy.financial existed, and I appreciate your calling
> attention
> to the possibility that there could be problems.
> With this in mind.  It looks like just trying to
> follow these formulas
> has led to some problems.  There are different
> "formulas" for the
> modified internal rate of return out there, but they're all
> trying to
> say the same thing just not always very clearly, and this
> led to
> np.mirr being incorrect (though it looks like what the
> formula in the
> OpenFormula doc, for instance, says just not what it means
> and does).
> I have filed a ticket here
> <http://projects.scipy.org/numpy/ticket/1138> with a
> patch and tests.
> Please let me know if I haven't done the patching and tests
> correctly.

> Skipper
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