Skip to content

match problem by rownames

3 messages · Xianming Wei, Dimitris Rizopoulos, Charilaos Skiadas

Xianming Wei
# 
Hi all,

While dat['a1',] and dat['a10',] produce the same results in the
following example, I'd like dat['a1',] to return NAs.

dat <- data.frame(x1 = paste(letters[1:5],10, sep=''), x2=rnorm(5))
rownames(dat) <- dat$x1
dat['a1',]
dat['a10',]
R version 2.7.2 (2008-08-25)
i386-pc-mingw32

locale:
LC_COLLATE=English_Australia.1252;LC_CTYPE=English_Australia.1252;LC_MON
ETARY=English_Australia.1252;LC_NUMERIC=C;LC_TIME=English_Australia.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base


other attached packages:
[1] lattice_0.17-13

loaded via a namespace (and not attached):
[1] grid_2.7.2
Regards,
Xianming



DISCLAIMER:\ For details of our e-mail disclaimer, pleas...{{dropped:15}}
Dimitris Rizopoulos
# 
try this:

dat <- data.frame(x1 = paste(letters[1:5],10, sep=''), x2=rnorm(5))
row.names(dat) <- dat$x1

dat['a1' %in% row.names(dat), ]
dat['a10'  %in% row.names(dat), ]


I hope it helps.

Best,
Dimitris

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Charilaos Skiadas
    

    

      
      #
    

  


  

      
As suggested in ?"[.data.frame", try:

dat[match('a1', rownames(dat)),]


Haris Skiadas
Department of Mathematics and Computer Science
Hanover College

        
On Sep 9, 2008, at 2:41 AM, Xianming Wei wrote: