From ripley@stats.ox.ac.uk  Mon Dec 17 23:36:19 2001
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Tue, 18 Dec 2001 00:36:19 +0100 (MET)
Subject: [Rd] write.table (PR#1219)
Message-ID: <200112172336.AAA10190@pubhealth.ku.dk>

On Tue, 18 Dec 2001 olshena@mskcc.org wrote:

> Full_Name: Adam B. Olshen
> Version: 1.3.1
> OS: Linux
> Submission from: (NULL) (140.163.222.233)
>
>
> There appears to be a bug with write.table if the object being written is a
> matrix.
> Specifically, the option row.names=F gives an error.  I have seen this problem
> repeated in the Windows implementation.  An example is below.
>
> Adam Olshen
> olshena@mskcc.org
>
> This works:
>
> > write.table(matrix(rnorm(100),10),"blah",row.names=T)
>
> And this works:
>
> > write.table(as.data.frame(matrix(rnorm(100),10)),"blah",row.names=F)
>
> This does not work:
>
> > write.table(matrix(rnorm(100),10),"blah",row.names=F)
> Error in gsub(pattern, replacement, x, ignore.case, extended) :
>         invalid argument

Actually, this happens only for numerical matrices, so just do

X <- matrix(rnorm(100),10)
X[] <- as.character(X)
write.table(X,"blah",row.names=F)

or even

write.table(X,"blah",row.names=F, quote=F)

Note though that for almost all purposes

write.table(format(X), "blah",row.names=F, quote=F)

would be better.

Nevertheless I'll put in the obvious fix for 1.4.0.

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


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[Rd] write.table (PR#1219)
ripley@stats.ox.ac.uk