[R] How to open a file with a name changed?

[David Winsemius]

On May 24, 2012, at 7:45 PM, Minerva Mora wrote:

> Hi, I apologize for my english.
>
> I´m trying to read a file, but the name of this file changes every  
> day, for
> example: today is May 24, 2012
>
> bonos<- read.table("C:/Bonos/*20120524*.csv", header=TRUE, sep="\t")
>
> So, tomorrow I want to read the file again, but i don´t want to put  
> the date
> by myself, i want this automatically. I know that if a put day() this
> instruccion gives me the date.
>
> My problem is, I don´t know how to concatenate these:
> -"C:/Bonos/
> -the date
> -.csv"
>

or even :

paste( gsub("-", "", Sys.Date() ) )
[1] "20120524"

filname <- paste("C:/Bonos/", gsub("-", "", Sys.date() ) , sep="")

-- 
David.


> I tried this:
> bonos<- read.table(cat(cit,dia,extension), header=TRUE, sep="\t")
> where
> --cit is *"\"C:/Bonos/"*
> --dia is *dia<-format(today, "%Y%m%d")*
> --extension is *extension<-".csv\""*
>
> but i have this problem:
> "C:/Bonos/ 20120524 .csv"*Error in read.table(cat(cit, dia,  
> extension),
> header = TRUE, sep = "\t") : * * 'file' must be a character string or
> connection*
>
> What can i do?
>
> Thanks!
>
> --
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>
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David Winsemius, MD
West Hartford, CT