[R] row.names - problem with vers. 1.4.1

Liaw, Andy
Fri, 23 Aug 2002 12:57:17 -0000

Your "problem" is not specific to 1.4.1, or even R.  read.table
generates a
data frame, and data frame *must* have unique row names in all versions of R
and Splus (well, almost...).

If you don't need the row and column names, preprocess the file first.  If
you know the number of columns in the file, use scan() instead of
read.table.  It'll be much faster and memory efficient.  For example:

## strip out the first column
cmd <- paste("cut -d' ' -f2- ", path, "prices",
date, ".txt", sep="")
prices <- matrix(scan(pipe(cmd), skip=1), byrow=TRUE, ncol=????)

HTH,
andy

> -----Original Message-----
> From: Herr.Alfred at gmx.net [mailto:Herr.Alfred at gmx.net]
> Sent: Friday, August 23, 2002 3:07 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] row.names - problem with vers. 1.4.1
>
>
> Hi,
>
> need a little help:
>
> I want to handle a file with a first column like this:
> ...
> 27.10.98
> 28.10.98
> 29.10.98
> ...
>
> In vers. 1.5.1 I can use a statement like:
>
> # load daily
> prices
>
prices<-as.matrix(read.table(paste(path,"prices",date,".txt",s
> ep=""),row.names=1,header=T))
>
> In ves. 1.4.1 R generates an ERROR:
> Error in "row.names<-.data.frame"(*tmp*, value = row.names) :
>         duplicate row.names are not allowed
>
> For a reason too complex to explain I HAVE TO use 1.4.1! Can
> anyone tell me
> how to solve this problem in 1.4.1?
>
> TIA,
> Alfred.
>
> --
>
>
>
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