On 9 Sep 2013 20:46, "Skip Montanaro" <s...@pobox.com> wrote: > > > However, it's common in economic statistics to have a rectangular > > array, and extract both certain rows (tuples of observations on > > variables) and certain columns (variables). For example you might > > have data on populations of American states from 1900 to 2012, and > > extract the data on New England states from 1946 to 2012 for analysis. > > When Steven first brought up this PEP on comp.lang.python, my main concern > was basically, "we have SciPy, why do we need this?" Steven's response, which > I have come to accept, is that there are uses for basic statistics for > which SciPy's > stats module would be overkill. > > However, once you start slicing your data structure along more than one axis, I > think you very quickly will find that you need numpy arrays for performance > reasons, at which point you might as go "all the way" and install SciPy. I don't > think slicing along multiple dimensions should be a significant concern for this > package. > > Alternatively, I thought there was discussion a long time ago about > getting numpy's > (or even further back, numeric's?) array type into the core. Python > has an array type > which I don't think gets a lot of use (or love). Might it be > worthwhile to make sure the > PEP 450 package works with that? Then extend it to multiple dimensions? Or just > bite the bullet and get numpy's array type into the Python core once > and for all? > > Sort of Tulip for arrays...
Aka memoryview :) Stefan Krah already fixed most of the multidimensional support issues in 3.3 (including the "cast" method to reinterpret the contents in a different format). The main missing API elements are multidimensional slicing and the ability to export them from types defined in Python. Cheers, Nick. > > Skip > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/ncoghlan%40gmail.com
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