[R] Where the data file is stored?

[Barry Rowlingson]

On Thu, Aug 12, 2010 at 4:51 PM, Stephen Liu <satimis at yahoo.com> wrote:
> Hi Barry,
>
>
> Following 2 commands are useful to me;
>> row.names(subset(file.info(list.files(getwd(),full.name=TRUE)),isdir))
> showing directories.
>
>> row.names(subset(file.info(list.files(getwd(),full.name=TRUE)),!isdir))
> showing files
>
>
> What is "!" for?  TIA

 It means 'not'. So TRUE becomes FALSE and FALSE becomes TRUE. And NA stays NA.

 Use it when you need to invert logical values.

Barry