[R] User input(unknown name and number of files)

Bansal, Vikas vikas.bansal at kcl.ac.uk
Fri Jul 22 21:30:43 CEST 2011

Thanks for your reply.That is why I wrote in the message that I have sent this message before but did not get any help (first line of my message).
can you please tell me that if user will input 50 files or 100 how my code will work.Do I need to write file1,file2 till file 100 in this code?

lapply(c("file1", "file2", etc.), yourfunction)
From: Joshua Wiley [jwiley.psych at gmail.com]
Sent: Friday, July 22, 2011 8:26 PM
To: Bansal, Vikas
Cc: r-help at r-project.org
Subject: Re: [R] User input(unknown name and number of files)

On Fri, Jul 22, 2011 at 12:15 PM, Bansal, Vikas <vikas.bansal at kcl.ac.uk> wrote:
> Dear all,
> I need your help as I was not able to find out the solution.I sent this message before but did not get any help.Please help me.

You only sent the message yesterday!!! (then again a few hours ago,
and *again* just now)

rather than hard code what you are doing, create a function that takes
a data file and outputs the type of data you want.  Then just:

lapply(c("file1", "file2", etc.), yourfunction)

will create a list of all the output.


> The thing is-
> I am having a code which is reading file with this code-
> df=read.table("Case2.pileup",fill=T,sep="\t",colClasses="character")
>  but as am making a tool so that user can use it and can do analysis on his file.But the name of the file will not be Case2.pileup and I want to use this code so that user can input as many files as he want.My code is like this-
> df=read.table("Case2.pileup",fill=T,sep="\t",colClasses="character")
> df$V9 <-  apply(df, 1, function(x) gsub("\\:|\\$|\\^|!|\\-|1|2|3|4|5|6|7|8|10", "",x[9]))
> df$V10 <- sapply(df$V10, function(a)
>  paste(as.integer(charToRaw(a)), collapse = ' '))
> capture.output(print.data.frame(df,row.names=F), file = "end.txt", append = FALSE)
> I know it should do it with for loop and an array.I want that if user input 12 files,the dataframe name df should be different for all the 12 files.
> Can you please tell me how can I do this.
> Thanking you,
> Warm Regards
> Vikas Bansal
> Msc Bioinformatics
> Kings College London
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles

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