[R] reading non-existent files

[Jesus Frias]

Hi Christian,

	I suppose that you are doing this in a loop and is stopping.

	Have a look at the function try()

?try

Try an Expression Allowing Error Recovery.

Description:

     `try' is a wrapper to run an expression that might fail and allow
     the user's code to handle error-recovery.

Usage:

     try(expr, first = TRUE)


regards,

Jesus

--------------------------------------------------------------
Jesús María Frías Celayeta
School of Food Sci. and Env. Health.
Faculty of Tourism and Food
Dublin Institute of Technology
Cathal Bruha St., Dublin 1. Ireland
Phone: +353 1 4024459 Fax: +353 1 4024495
http://www.dit.ie/DIT/tourismfood/science/staff/frias.html
--------------------------------------------------------------

> -----Original Message-----
> From: r-help-admin at stat.math.ethz.ch
> [mailto:r-help-admin at stat.math.ethz.ch]On Behalf Of
> Christian.Stratowa at vie.boehringer-ingelheim.com
> Sent: 28 January 2003 14:59
> To: r-help at stat.math.ethz.ch
> Subject: [R] reading non-existent files
>
>
> Dear R-experts
>
> I would like to read all files from a directory, the files have names
> "myname0001.txt" etc. I paste the directory plus file names and
> use "read.delim()".
> My problem is that some file names are missing, so I get an error
> and my program stops.
> Is there a way to check for a null pointer analogous to C, so that
> I can simply skip non-existent filenames?
>
> Please do "Reply to all" since in the company I am not subscribed
> to the R-help list.
>
> Thank you in advance
> Best regards
> Christian Stratowa
>
> ==============================================
> Christian Stratowa, PhD
> Boehringer Ingelheim Austria
> Dept NCE Lead Discovery - Bioinformatics
> Dr. Boehringergasse 5-11
> A-1121 Vienna, Austria
> Tel.: ++43-1-80105-2470
> Fax: ++43-1-80105-2683
> email: christian.stratowa at vie.boehringer-ingelheim.com
>
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