[R] write.table with append=T after using cat on same file

[Mark Sharp]

I do not get an error with R-3.2.1 on Mac OS. You may have done something prior to this code so that perhaps F is not FALSE or T is not TRUE.

R. Mark Sharp, Ph.D.
msharp at TxBiomed.org





> On Jul 27, 2015, at 3:32 PM, Waichler, Scott R <Scott.Waichler at pnnl.gov> wrote:
> 
> Hi, 
> 
> For years I've been writing text to the beginning of files with cat(append=F) , then following that text with data written by write.table(append=T).  It is now giving me an error message.  I'm using R-3.1.2.  What gives?
> 
> df <- data.frame(x = 1, y = 1:10, z = 10:1)
> cat(file="junk.txt", sep="", "# An introductory note.\n")
> write.table(df, file="junk.txt", sep=",", append=T, quote=F, row.names=F, col.names=F)
> 
> Error in file(file, ifelse(append, "a", "w")) : invalid 'open' argument
> 
> Thanks,
> Scott Waichler
> Pacific Northwest National Laboratory
> Richland, WA  USA
> 
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