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: [EMAIL PROTECTED] To: [EMAIL PROTECTED] 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 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
