[R] reading multiple files

[Uwe Ligges]

Dave Evens wrote:

> Dear All,
> 
> 
> How do I read in multiple data frames or matrices in a
> loop, e.g.
> 
> for (i in 1:n) {
>    channel <- odbcConnectExcel("filenames")
>    file[i] <- as.data.frame(sqlFetch(channel,
> "sheet"))
> }
> 
> I would like file[i] to be the name of the data.frame
> (i.e. file[1], file[2], file[3],...etc) rather than a
> vector.

The terminology you are using re. R objects seems to be rather confused.

Quite probably you want a list of data frames such as using the 
filenames as names for the list elements along the follwoing lines:

library(RODBC)
dataframes <- vector(mode="list", length=length(filenames))
names(dataframes) <- filenames
for(i in filenames){
   channel <- odbcConnectExcel(i)
   dataframes[[i]] <- sqlFetch(channel, "sheet")
   close(channel)
}


Uwe Ligges



> Thanks in advance for any help.
> 
> Dave
> 
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