[R] loop with files

[Monica Pisica]

Hi,

I am not sure this is what you want …. But

alist <- list.files(path = "whatever path you have for your files", full.names = TRUE)

Now you have a list with the names of your files …. Form each name you can make a variable name and assign that file ….

fname <- substring(alist[i], first, last)
n <- length(alist)

resultList <- list()
for( i in 1:n){
resultList[[i]] <- read.table(alist[i])  ### this only if the *.rwl is a kind of table …. I am not familiar with this extension so I have no idea how you read it in R
}
names(resultList) <- fname 

Now you have a list of your data named as you want ….. you have access to it or any of the list members

I am not taking credit .... the question about using a list to name variables was put before and Greg Snow came up with the list() idea - i think.

Hope this helps if this is what you want,

Monica

Message: 4
Date: Tue, 24 Jun 2008 12:37:44 +0200
From: Wacek Kusnierczyk 
Subject: Re: [R] loop with files
To: R help 
Message-ID: 
Content-Type: text/plain; charset=ISO-8859-1
 
Alfredo Alessandrini wrote:
>> can you *explain* what the goal is?
>> 
>
> I want import any rwl files (cimfasy.rwl, rocquce.rwl, .......), in a
> data.frame with the name like to name of file rwl:
>
> cimfasy.rwl -> cimfasy
>
> rocquce.rwl -> rocquce
>
> with this loop:
>
> 
>> library(dplR)
>>
>> files <- system("ls *.rwl", intern=TRUE)
>>
>> files
>> 
> [1] "cimfasy.rwl" "rocquce.rwl"
> 
>> for (i in files) {a <- read.rwl(i,header=0)}
>> 
 
for (file in files)
assign(gsub("\\.rwl$", "", file), read.rwl(file, header=0))
 
?assign
?gsub
 
vQ

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