Re: [R] sparse data frame (crsp?)

From: <ivo_welch-rstat8303_at_mailblocks.com>
Date: Tue 26 Jul 2005 - 11:49:11 EST

thank you for the hints. a matrix is and it isn't the right tool for the job. it is really a data frame, not a matrix. the columns have meanings. actually, a more general data frame would make a nice feature for the future---as if the folks doing the R development did not have enough to do ;-). one particular kind of sparse data set implementation would make sense, in which either rows or columns are assumed to be contiguous, and an internal R parameter determines the start and end. I bet there are many data sets that take the form of data that is available for a a consecutive set of columns only. the data structure implementation of such a data frame may not be too difficult, either.

regards,

/iaw

---
ivo welch



-----Original Message-----
From: roger@ysidro.econ.uiuc.edu
To: ivo_welch-rstat8303@mailblocks.com
Cc: r-help@stat.math.ethz.ch
Sent: Mon, 25 Jul 2005 03:58:09 -0500 (CDT)
Subject: Re: [R] sparse data frame (crsp?)

You could try reading it in a chunk at a time and making a sparse
matrix with SparseM, unless you really need some functionality
of dataframes.

R Koenker

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Received on Tue Jul 26 11:55:13 2005

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