From murdoch.duncan at gmail.com  Fri Sep  2 02:30:19 2011
From: murdoch.duncan at gmail.com (Duncan Murdoch)
Date: Thu, 01 Sep 2011 20:30:19 -0400
Subject: [Rd] "\088" is legal syntax?
In-Reply-To: <E66794E69CFDE04D9A70842786030B9304EE3E@PA-MBX04.na.tibco.com>
References: <E66794E69CFDE04D9A70842786030B9304EE3E@PA-MBX04.na.tibco.com>
Message-ID: <4E60239B.8070105@gmail.com>

On 11-09-01 5:43 PM, William Dunlap wrote:
> Is it intentional that the digit 8 is allowed
> in octal escape sequences in character literals?
>
>    >  "\110" == "\088"
>    [1] TRUE
>    >  "\8" == "\b"
>    [1] TRUE
>
> 9's are rejected, so I'd expected 8's to be illegal as well.

It is documented that way in the R-lang manual, but I imagine it's just 
a thinko.  It's been like that since octal escapes were added in 1998. 
I wonder how much will break if I fix it?

Duncan Murdoch

>
>    >  "\9"
>    Error: '\9' is an unrecognized escape in character string starting "\9"
>    >  "\091")
>    Error: embedded nul in string: '\091'
>
> Bill Dunlap
> Spotfire, TIBCO Software
> wdunlap tibco.com
>
>> sessionInfo()
> R version 2.13.1 (2011-07-08)
> Platform: x86_64-unknown-linux-gnu (64-bit)
>
> locale:
>   [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
>   [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
>   [5] LC_MONETARY=C              LC_MESSAGES=en_US.UTF-8
>   [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
>   [9] LC_ADDRESS=C               LC_TELEPHONE=C
> [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel



[Rd] "\088" is legal syntax?
Duncan Murdoch