Re: [R] "Large" data set: performance issue

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From: Peter Dalgaard BSA (p.dalgaard@biostat.ku.dk)
Date: Wed 03 Apr 2002 - 00:16:41 EST 

Message-id: <x2wuvqgp86.fsf@blueberry.kubism.ku.dk>

Till Baumgaertel <till.baumgaertel@epost.de> writes:

> hi all,
>
> I've got to import CSV-datasets (with variable-names in the first line)
> into data.frames. each is about 12MB (or more!) with 1823 columns and about
> 500 rows. the first 22 columns are in "character"-mode, the rest is "numeric".
>
> I run R 1.4.1 on a Windows 2000 system.

What happens if you try this?:

datfull <- read.csv("foo", colClasses=rep(c("character","numeric"),c(22,1801))) 

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