[R] Removing Corrupt file

[Claudia Beleites]

Vikrant,

if you execute the code inside a function like

jpegplotfun <- function (a, b){
    jpeg("mygraph.jpeg")
    plot(a,b)
    dev.off()
}

the dev.off () is not executed if an error occurs before. So the problem is 
basically that the jpeg file is still open (you may noticed open devices in R as 
left overs of these errors).

See ? try  and ? on.exit for ways to deal with situations where you need to 
clean up after errors.

HTH,

Claudia

On 12/17/2010 08:24 AM, vikrant wrote:
>
> Hi
>   I am generating a graph jpeg file using a function R.  I m using this
> script
> a<- 1:10
> b<- 1:10
> jpeg("mygraph.jpeg")
> {
>   plot(a,b)
> }
> dev.off()
>
>
> If by some chance I do miss some values suppose for a , the file gets
> created initially and then we do not plot anything in it. This file now
> becomes corrupted and we cannot delete this file from current R Session.
> I Have tried commands like file.remove() and unlink to remove the corrupt
> file from current  R session.
> Is there any other way inorder to remove such files??
>
>
>
> Thanks&  Regards,
> Vikrant
>
>


-- 
Claudia Beleites
Dipartimento dei Materiali e delle Risorse Naturali
Università degli Studi di Trieste
Via Alfonso Valerio 6/a
I-34127 Trieste

phone: +39 0 40 5 58-37 68
email: cbeleites at units.it