NA rownames in dataframes - R-help

Wed, Aug 28, 2002 11:57 AM #

Hey everyone!

I am seeing strange behavior with NA in the rownames of dataframes:

X1.3
r1        1
<NA>      2
r3        3

Everything works.  The peculiar thing is that when the NA is in the first
row, things no longer work as I would have expected:

Error in if (missing(row.names) && (nrows[i] > 0) && (rowsi[[1]] != ""))
row.names <- data.row.names(row.names,  : 
	missing value where logical needed

Error in if (missing(row.names) && (nrows[i] > 0) && (rowsi[[1]] != ""))
row.names <- data.row.names(row.names,  : 
	missing value where logical needed

3: data.frame(..., check.names = FALSE)
2: cbind(...)
1: cbind(b)

This seems to be a problem associated only with dataframes, as a similar
example using matrices works perfectly fine.  Has anyone experienced this
behavior before?

Thanks!

Derek

_                   
platform sparc-sun-solaris2.6
arch     sparc               
os       solaris2.6          
system   sparc, solaris2.6   
status                       
major    1                   
minor    5.1                 
year     2002                
month    06                  
day      17                  
language R
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Brian Ripley

Wed, Aug 28, 2002 12:54 PM #

It's a bug in data.frame.  You should not be allowed NA rownames.
Solution: don't specify them.

I'll add a test for 1.6.0.

On Wed, 28 Aug 2002, Yi, Derek wrote:

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Peter Dalgaard

Wed, Aug 28, 2002 1:09 PM #

"Yi, Derek" <Derek.Yi at FMR.COM> writes:

Not to my knowledge, on this list, anyway. However, it looks like a
fairly clear bug. I think you want 

... && !(rowsi[[1]] %in% "")

in the relevant line about two-thirds through data.frame().

Character NA's (as opposed to the string "NA") are a relatively new
invention, and oversights like this are bound to happen.

(NA rownames are generally a bad idea, though...)

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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