[R] concatenating multiple columns from files

[Stephen Tucker]

You can do something like

mat <- do.call(cbind, lapply(list.files(".data"),read.table))


## explanation:

lapply(list.files(".data"),read.table)
will store all tables in a list

do.call(cbind,...)
will bind all the columns stored in the list created above.


----- Original Message ----
From: ferreirafm <ferreirafm at lim12.fm.usp.br>
To: r-help at r-project.org
Sent: Thursday, July 30, 2009 5:29:46 PM
Subject: [R]  concatenating multiple columns from files


R-users,
I want to concatenate columns from different files in a  single object. 
I'm doing bad. My peace of code is as follow:

rawdata <- list.files("./data")

for (i in rawdata) {
  mat[ ] <- read.table(paste(i ,sep=""))
}

At the end of the loop I have just one column. What I'm doing wrong?
Thanks,
Fred

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