This is the mail archive of the cygwin mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: R 2.15.1-1 sub() function produces unexpected output


On 10/12/2012 9:18 AM, Toby Johnson wrote:

The sub() function in R 2.15.1-1 produces unexpected output. Here is a minimal piece of R code:

I see the same result here, except that I tested with R 2.15.1 in both Windows native and Cygwin versions, as opposed to your test which used a different version on Linux. That means we can rule out a 2.14 -> 2.15 difference and the OS difference.


I believe sub() is using PCRE for this, per http://goo.gl/XxDyB

I ldd'd the Cygwin R binary[*] and it's linking to cygpcre-1.dll, which is PCRE 8.31 if your Cygwin is up to date. Since the PCRE packaged with the R sources is 8.30 (per http://goo.gl/O2UMk) you would think this is fine. If anything, this setup should result in *fewer* bugs, not more.

That said, I don't see any better idea than trying to rebuild Cygwin R with different regex libraries. If I were to go about it, I'd first try building R with the packaged PCRE instead of the platform PCRE, then if that gave the same result, build without PCRE entirely.




[*] You'd guess "ldd `which R`" but you'd be wrong. The binary is hidden behind two layers of indirection:


ldd /usr/lib/R/bin/exec/R.exe

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]