memory blues
On Mon, 9 Jul 2001, Laurent Gautier wrote:
It seems a data.frame with only one column becomes a special case.... and I cannot figure out why (I'd see no problem in being told to rtfm, I could not find anything about that in the help pages)
data.frame() ideally makes up names from the tags of the arguments, eg
data.frame(a=1:5,b=rnorm(5))
a b 1 1 -2.0499827 2 2 -0.4364342 3 3 0.5880059 4 4 -0.7636817 5 5 -1.3021187 If the arguments don't have tags it converts the expressions into names, so in this example data.frame tried to convert 1:5, rnorm(5) and rep(1,5) into valid names.
data.frame(1:5,rnorm(5),rep(1,5))
X1.5 rnorm.5. rep.1..5. 1 1 -0.5282023 1 2 2 0.6964649 1 3 3 1.1548943 1 4 4 1.3833800 1 5 5 -0.1553645 1 This approach isn't sufficient when one of the arguments to data.frame has multiple columns. Ideally the column names of the matrix are used but if one of the arguments is a matrix that itself has no column names then data.frame falls back on the unimaginative "X1","X2".. The moral of the story is that you can make up better names than data.frame can. -thomas Thomas Lumley Asst. Professor, Biostatistics tlumley at u.washington.edu University of Washington, Seattle -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._