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sub() and gsub() (PR#1826)

4 messages · Brian Ripley, Thomas Lumley, Jerome Asselin

Original
Jerome Asselin
# 
Full_Name: Jerome Asselin
Version: 1.5.1
OS: linux redhat 7.2
Submission from: (NULL) (142.103.173.179)



gsub() return different answers depending on how the input
variables were created. Here is an example of code that
replicates the problem. The vectors y and yy appear to be
the same, but gsub() doesn't return the same answer.
It should remove all the blanks when I use the vector y,
but it doesn't remove them all. I have also tested that
the same problem occurs if sub() is used instead of gsub().

x <- structure(c(1, 3, 4, 5), class = "factor",
     .Label = c("1 ", "2 ", "3 ", "4 ", "5 "))
y <- as.character(x)
y
gsub(" ","",y)

yy <- c("1 ","3 ","4 ","5 ")
yy
gsub(" ","",yy)


Below is the output that I have when I execute those commands.
+      .Label = c("1 ", "2 ", "3 ", "4 ", "5 "))
[1] "1 " "3 " "4 " "5 "
[1] "1"  "3"  "4 " "5 "
[1] "1 " "3 " "4 " "5 "
[1] "1" "3" "4" "5"



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Brian Ripley
# 
Those are not blanks!  You have character <A0> in there. less on your
email gives me
+      .Label = c("1 ", "2 ", "3 ", "4<A0>", "5<A0>"))
[1] "1 " "3 " "4<A0>" "5<A0>"
[1] "1"  "3"  "4<A0>" "5<A0>"

which is correct.

Pilot error, I believe ....
On Tue, 23 Jul 2002 jerome@hivnet.ubc.ca wrote:

            

      
      
      
    

        

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Thomas Lumley
    

    

      
      #
    

  


  

      
On Tue, 23 Jul 2002 jerome@hivnet.ubc.ca wrote:

        

            

      
      
      
    

        
I can't reproduce this (1.5.1, Debian Linux). I get

            

      
      
      
    

        
[1] "1 " "3 " "4 " "5 "

            

      
      
      
    

        
[1] "1 " "3 " "4 " "5 "

            

      
      
      
    

        
[1] "1" "3" "4" "5"

            

      
      
      
    

        
[1] "1" "3" "4" "5"

            

      
      
      
    

        
[1] TRUE

            

      
      
      
    

        
[1] TRUE

There used to be a possible bug where the R length and C length of a
string would be different (PR#1724), which might cause that sort of thing,
but the known manifestations of it were removed in 1.5.1


	-thomas

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      Jerome Asselin
    

    

      
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Yes. I immediately noticed it when I viewed my bug report on the 
internet. Those characters appeared blank on my screen before I 
submitted the bug report. I tried to submit a change for this bug, but 
perhaps I don't have the privilege to do so. Sorry about this...

Sincerely,
Jerome Asselin

        
On Tuesday 23 July 2002 14:01, you wrote: