[R] scan errors
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Aug 18 14:40:59 CEST 1999
> Date: Wed, 18 Aug 1999 13:51:42 +0200
> From: Carlos Corral van Damme <cfcorral at gmv.es>
> X-Accept-Language: es
[I hope you accept en too.]
> Is there any way to ignore the error produced when the function
> scan(file="...") cannot open the file (due to, e.g., the file does not
Use file.exists to check the file exists. If you need more information,
you can use system calls, but they will be OS-specific. On Unix,
a call via system() to `test' normally can tell you all you need.
On Windows, you can call attrib.
You can also use restart to catch the error (needs 0.65; which says
Use of this code is very likely to result in an infin-
ite loop. It should be avoided at all costs and is
included in R for compatibility with S. The soon to
appear R exception handling should remove all need for
such a function.
`soon to appear' means at least 0.66 as it has missed the
feature-freeze on 0.65, so don't wait for it.)
> I am also very interested in ways to label a contour plot.
Label the contours? So are we all! Last time I asked (several months
ago) it was Real Soon Now (TM).
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)
1 South Parks Road, +44 1865 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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