R help - Jun 2013 - Reading multiple csv files with a for loop

Dear R-help users,

I am quite new in R. I have multiple csv.files with different size. I would
like to read them by using a for- loop and parallel by reading I need to add
a new column which can be specified by myself.

But my for-loop does not work !
Could somebody give me any idea ?
Many thanks!

myfiles <-list()
for ( i in 1:11) myfiles[i] <- read.csv(toread,header = TRUE, sep=")
names(myfiles) <- paste(myfiles)
mytotalfiles <- myfiles

#sample the data by the number of the columns by adding a new column 
sample(i1, 1000, replace = FALSE, prob = NULL)
for n <- 1000
sample <- myfiles[sample(nrow (df), 1000),]







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Hello,

You are reading 11 times the same file, 'toread'.
Assuming that 'toread' is a vector with 11 different filenames in it, 
something like the following might do what you want.

for ( i in 1:11) myfiles[i] <- read.csv(toread[i], header = TRUE, sep=")

AS for the final "for loop", it does nothing. Why have you posted that
ugly thing?

Hope this helps,

Rui Barradas

Em 17-06-2013 10:01, Dzu escreveu:
> Dear R-help users,
>
> I am quite new in R. I have multiple csv.files with different size. I would
> like to read them by using a for- loop and parallel by reading I need to
add
> a new column which can be specified by myself.
>
> But my for-loop does not work !
> Could somebody give me any idea ?
> Many thanks!
>
> myfiles <-list()
> for ( i in 1:11) myfiles[i] <- read.csv(toread,header = TRUE,
sep=")
> names(myfiles) <- paste(myfiles)
> mytotalfiles <- myfiles
>
> #sample the data by the number of the columns by adding a new column
> sample(i1, 1000, replace = FALSE, prob = NULL)
> for n <- 1000
> sample <- myfiles[sample(nrow (df), 1000),]
>
>
>
>
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Reading-multiple-csv-files-with-a-for-loop-tp4669681.html
> Sent from the R help mailing list archive at Nabble.com.
>
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