[Rd] Unexpected dimnames attribute returned by cbind/rbind

[Hervé Pagès]

Hi,

   > m5 <- cbind(integer(5), integer(5))
   > m5
        [,1] [,2]
   [1,]    0    0
   [2,]    0    0
   [3,]    0    0
   [4,]    0    0
   [5,]    0    0
   > dimnames(m5)
   NULL

No dimnames, as expected.

   > m0 <- cbind(integer(0), integer(0))
   > m0
        [,1] [,2]
   > dimnames(m0)
   [[1]]
   NULL

   [[2]]
   NULL

Unexpected dimnames attribute!

rbind'ing empty vectors also returns a matrix with unexpected
dimnames:

   > dimnames(rbind(character(0), character(0)))
   [[1]]
   NULL

   [[2]]
   NULL

Cheers,
H.

-- 
Hervé Pagès

Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
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P.O. Box 19024
Seattle, WA 98109-1024

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