From sambler at linkedin.com  Sat Nov 22 21:49:46 2014
From: sambler at linkedin.com (Stuart Ambler)
Date: Sat, 22 Nov 2014 20:49:46 +0000
Subject: [Rd] R string comparisons may vary with platform (plain text)
In-Reply-To: <5470F51F.1000802@gmail.com>
References: <D0962B34.6441%sambler@linkedin.com> <5470F51F.1000802@gmail.com>
Message-ID: <D0963606.647D%sambler@linkedin.com>

You mean where it says that some platforms may not respect the locale (I
assume, though don?t know, that en_US.UTF-8 and en_US.utf8 would be the
same)?  But I gather that the general problem has been looked into and is
difficult to solve; thanks.

On 11/22/14, 12:42 PM, "Duncan Murdoch" <murdoch.duncan at gmail.com> wrote:

>On 22/11/2014, 2:59 PM, Stuart Ambler wrote:
>> A colleague?s R program behaved differently when I ran it, and we
>>thought
>> we traced it probably to different results from string comparisons as
>> below, with different R versions.  However the platforms also differed.
>> A
>> friend ran it on a few machines and found that the comparison behavior
>> didn?t correlate with R version, but rather with platform.
>> 
>> I wonder if you?ve seen this.  If it?s not some setting I?m unaware of,
>> maybe someone should look into it.  Sorry I haven?t taken the time to
>>read
>> the source code myself.
>
>Looks like a collation order issue.  See ?Comparison.
>
>Duncan Murdoch
>
>> Thanks,
>> Stuart
>> 
>> R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"
>> Platform: x86_64-unknown-linux-gnu (64-bit)
>> Sys.getlocale()
>> [1] 
>> 
>>"LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.U
>>TF
>> 
>>-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;L
>>C_
>> 
>>NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFI
>>CA
>> TION=C"
>> 
>> "-1" > "1"
>> [1] TRUE
>> 
>> "-1" <"1"
>> [1] FALSE
>> 
>> "1" < "-1"
>> [1] TRUE
>> 
>> "1" < "-"
>> [1] FALSE
>> 
>> Vs.
>> 
>> R version 3.1.1 (2014-07-10) ? ?Sock it to Me"
>> Platform: x86_64-redhat-linux-gnu (64-bit)
>> Sys.getlocale()
>> [1] 
>> 
>>"LC_CTYPE=en_US.utf8;LC_NUMERIC=C;LC_TIME=en_US.utf8;LC_COLLATE=en_US.utf
>>8
>> 
>>;LC_MONETARY=en_US.utf8;LC_MESSAGES=en_US.utf8;LC_PAPER=en_US.utf8;LC_NAM
>>E
>> 
>>=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.utf8;LC_IDENTIFICATIO
>>N
>> =C"
>> 
>> "-1" > "1"
>> [1] FALSE
>> 
>> "-1" <"1"
>> [1] TRUE
>> 
>> "1" < "-1"
>> [1] FALSE
>> 
>> "1" < "-"
>> [1] FALSE
>> 
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>> 
>



[Rd] R string comparisons may vary with platform (plain text)
Stuart Ambler