[R] sparse data frame (crsp?)
ivo_welch-rstat8303@mailblocks.com
ivo_welch-rstat8303 at mailblocks.com
Tue Jul 26 03:49:11 CEST 2005
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 at ysidro.econ.uiuc.edu
To: ivo_welch-rstat8303 at mailblocks.com
Cc: r-help at 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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