[R] Eval and parse function applied on file path

Prof Brian Ripley
Sat, 18 Oct 2008 21:17:49 -0000

On Sat, 18 Oct 2008, Tomislav Pu?a wrote:

> Hi,
> I have problem when evaluating string containing file path.
>
> path
<-"inputDirectory='d:\\diplomski_rad\\testOutput\\temp'"
> print(eval(parse(text=path)))
>
> After executing code, I get
>
> [1] "d:diplomski_rad\testOutput\temp"
> Warning messages:
> 1: '\d' is an unrecognized escape in a character string
> 2: unrecognized escape removed from
"d:\diplomski_rad\testOutput\temp"
>
> I try different combination but without luck. What's the problem ?

Lack of quoting: you need to esape \ twice, for the parser and for the
string.  So that means liteally \\\\ .

Why not use '/' for file paths (see both the FAQ and rw-FAQ)?

And why not use
assign("-"inputDirectory",
'd:\\diplomski_rad\\testOutput\\temp')
?

>
> Regards,
> Tomislav
>
> 	[[alternative HTML version deleted]]

Please note that you were asked not to do this.

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--
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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