Hi
Your example works for me. Error is on your side.
Try ?traceback or start with plain R -vanilla or upgrade R.
> sessionInfo()
R Under development (unstable) (2015-06-15 r68521)
Platform: i386-w64-mingw32/i386 (32-bit)
Running under: Windows XP (build 2600) Service Pack 3
locale:
[1] LC_COLLATE=Czech_Czech Republic.1250 LC_CTYPE=Czech_Czech Republic.1250
[3] LC_MONETARY=Czech_Czech Republic.1250 LC_NUMERIC=C
[5] LC_TIME=Czech_Czech Republic.1250
attached base packages:
[1] stats datasets utils grDevices graphics methods base
other attached packages:
[1] lattice_0.20-31 fun_0.1
loaded via a namespace (and not attached):
[1] Rcpp_0.11.6 digest_0.6.8 MASS_7.3-40 grid_3.3.0
[5] plyr_1.8.3 nlme_3.1-120 gtable_0.1.2 magrittr_1.5
[9] scales_0.2.5 ggplot2_1.0.1 stringi_0.4-1 reshape2_1.4.1
[13] proto_0.3-10 tools_3.3.0 stringr_1.0.0 munsell_0.4.2
[17] colorspace_1.2-6
> version
_
platform i386-w64-mingw32
arch i386
os mingw32
system i386, mingw32
status Under development (unstable)
major 3
minor 3.0
year 2015
month 06
day 15
svn rev 68521
language R
version.string R Under development (unstable) (2015-06-15 r68521)
nickname Unsuffered Consequences
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of
> Waichler, Scott R
> Sent: Monday, July 27, 2015 10:32 PM
> To: R. Help
> Subject: [R] write.table with append=T after using cat on same file
>
> 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
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.
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