Okay, so I understood that appending can only happen row-wise. Therefore I tried with following code: > write.csv(matrix(1:5, 1), "dat.csv") > write.csv(matrix(1:5, 1), "dat.csv", append = TRUE) Warning message: In write.csv(matrix(1:5, 1), "dat.csv", append = TRUE) : attempt to set 'append' ignored
It is destroying my previous file. Where I have done wrong? Thanks, ----- Original Message ----- From: Uwe Ligges <lig...@statistik.tu-dortmund.de> To: Ron Michael <ron_michae...@yahoo.com> Cc: "r-help@r-project.org" <r-help@r-project.org> Sent: Thursday, 9 February 2012 1:07 AM Subject: Re: [R] Wriritng to a CSV file On 08.02.2012 20:14, Ron Michael wrote: > Dear all, let say I want to write a vector to a CSV file. So I can have > following syntax: > > write.csv(rnorm(10), "dat.csv") > > Now I want to add one more column into that existing file. If I use the same > code then existing file will be destroyed. Is there any functionality to add > without destroying the existing file? I have tries with 'append = TRUE' > however it is not working! > > Any suggestion will be highly appreciated. Since these text files are written line by line, you cannot add a column afterwards, you can just append rows. Hence read the first column and write a two column data.frame afterwards. Uwe Ligges > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
