Removing Corrupt file

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 is not making sense, see below.

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??

There was a question earlier this week that may have provoked an  
answer that applies:

?graohics.off  # followed by file.remove()

But I am puzzled. I would not have expected missing values in vectors  
offered to a plot command to have resulted in a corrupted file and I  
am unable to reproduce the behavior when I insert missing values into  
the "a" vector. This suggests you may have more fundamental problems  
with your installation of R (about which you have not provided the  
requested information).

David.
>
>
>
> Thanks & Regards,
> Vikrant
>
>
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David Winsemius, MD
West Hartford, CT