R devel - Mar 2006 - sub returns garbage (PR#8687)

Full_Name: Todd Bailey
Version: 2.1
OS: Mac OS-X 10.4.3
Submission from: (NULL) (87.112.79.124)


sub returns garbage in some strings when replacing something with nothing and
fixed=TRUE.  For example:
> a=c('hello','hello');
sub('lo','',a,fixed=TRUE)
[1] "hel"     "hel\0\0"
> a=c('hello','hello');
sub('lo','',a,fixed=FALSE)
[1] "hel" "hel"

> version
         _                        
platform powerpc-apple-darwin7.9.0
arch     powerpc                  
os       darwin7.9.0              
system   powerpc, darwin7.9.0     
status                            
major    2                        
minor    2.1                      
year     2005                     
month    12                       
day      20                       
svn rev  36812                    
language R

todd at baileywick.plus.com writes:
> Full_Name: Todd Bailey
> Version: 2.1
Er, 2.2.1....
> OS: Mac OS-X 10.4.3
> Submission from: (NULL) (87.112.79.124)
> 
> 
> sub returns garbage in some strings when replacing something with nothing
and
> fixed=TRUE.  For example:
> 
> > a=c('hello','hello');
sub('lo','',a,fixed=TRUE)
> [1] "hel"     "hel\0\0"
> > a=c('hello','hello');
sub('lo','',a,fixed=FALSE)
> [1] "hel" "hel"
Confirmed on Linux & Windows. We've seen this symptom a few times
before.... 
> 
> > version
>          _                        
> platform powerpc-apple-darwin7.9.0
> arch     powerpc                  
> os       darwin7.9.0              
> system   powerpc, darwin7.9.0     
> status                            
> major    2                        
> minor    2.1                      
> year     2005                     
> month    12                       
> day      20                       
> svn rev  36812                    
> language R
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
> 
-- 
   O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907

On Thu, 2006-03-16 at 22:28 +0100, todd at baileywick.plus.com
wrote:
> Full_Name: Todd Bailey
> Version: 2.1
> OS: Mac OS-X 10.4.3
> Submission from: (NULL) (87.112.79.124)
> 
> 
> sub returns garbage in some strings when replacing something with nothing
and
> fixed=TRUE.  For example:
> 
> > a=c('hello','hello');
sub('lo','',a,fixed=TRUE)
> [1] "hel"     "hel\0\0"
> > a=c('hello','hello');
sub('lo','',a,fixed=FALSE)
> [1] "hel" "hel"

This has been fixed in R Patched. From NEWS:

 o	sub(fixed = TRUE) could get wrong the length of the character
	string of elements of the result after the first.

>From my installation:
> a <- c('hello', 'hello'); sub('lo', '',
a, fixed=TRUE)
[1] "hel" "hel"
> a <- c('hello', 'hello'); sub('lo', '',
a, fixed=FALSE)
[1] "hel" "hel"


HTH,

Marc Schwartz

Peter Dalgaard <p.dalgaard at biostat.ku.dk> writes:
> todd at baileywick.plus.com writes:
> 
> > Full_Name: Todd Bailey
> > Version: 2.1
> 
> Er, 2.2.1....
> 
> > OS: Mac OS-X 10.4.3
> > Submission from: (NULL) (87.112.79.124)
> > 
> > 
> > sub returns garbage in some strings when replacing something with
nothing and
> > fixed=TRUE.  For example:
> > 
> > > a=c('hello','hello');
sub('lo','',a,fixed=TRUE)
> > [1] "hel"     "hel\0\0"
> > > a=c('hello','hello');
sub('lo','',a,fixed=FALSE)
> > [1] "hel" "hel"
> 
> Confirmed on Linux & Windows. We've seen this symptom a few times
> before.... 
...and fixed it, apparently! (Thanks Marc.) 

I claim XP braindamage -- I'm not Linuxifying my new ThinkPad until
FC5 is out.

-- 
   O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907