[SciPy-user] Table like array

Michael Sorich michael.sorich at gmail.com
Thu Mar 2 17:35:53 CST 2006

On 3/1/06, Travis Oliphant <oliphant.travis at ieee.org> wrote:
> Michael Sorich wrote:
> > Hi,
> >
> > I am looking for a table like array. Something like a 'data frame'
> > object to those familiar with the statistical languages R and Splus.
> > This is mainly to hold and manipulate 2D spreadsheet like data, which
> > tends to be of relatively small size (compared to what many people
> > seem to use numpy for), heterogenous, have column and row names, and
> > often contains missing data.
> You could subclass the ndarray to produce one of these fairly easily, I
> think.   The missing data item could be handled by a mask stored along
> with the array (or even in the array itself).  Or you could use a masked
> array as your core object (though I'm not sure how it handles the
> arbitrary (i.e. record-like) data-types yet).

Thanks for the replies. You mention that missing data could be stored in the
array itself. Can one use nan to indicate missing data? In some ways it
seems more convenient to store this data in the array itself rather than
have a second mask array.

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