[R] concatenating multiple columns from files

[ferreirafm]

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,


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