Cliff Behrens wrote:
Peter,
I've inserted response inline below:
Cliff
Peter Dalgaard wrote:
Cliff Behrens wrote:
Peter,
OK...here is reproducible, self-contained code:
library(gregmisc)
Relying on a 3rd party package is not kosher either... Whatever did
list("NA"=2) or l <- list(2); names(l) <- "NA" do to you?
I'm not sure what you mean by "3rd party?" I downloaded this package
from the CRAN site where I get all others. I don't understand your
question.
3rd party means that you didn't write it and neither did I/we. You are
requesting people to help you, yet expecting that they go out of their
way to install a package first. (As it happens, I really don't have
gregmisc on this machine.) You could easily have created an example of a
list with "NA" as a name, but that would of course have been work for
you rather than for people on the list.
columnNames <- c("A","B","C","D","N","a","b","c")
namePerms<- permutations(length(columnNames),2,columnNames,repeats=TRUE)
nameList <- paste(namePerms[,1],namePerms[,2],sep="")
dataList <- lapply(1:length(nameList), function(level) {})
names(dataList)<- nameList ## The "NA" is interpreted that the name
is missing for one list in dataList
If you inspect the contents of dataList, you will find the following
showing that the name "NA" is treated differently:
Anyways.... As I thought:
Remember that NA is a reserved word. You get the same kind of reaction
if you name an element "for" or "in". It denotes that you need to
quote the name for indexing with $:
I thought that since all of the names in namesList were type char, there
was no need to enclose these in quotation marks.
That's not the point. It works fine, it is just that the output is
showing you how to access the element afterwards.
> names(l) <- "NA"
> l$NA
Error: unexpected numeric constant in "l$NA"
> l$`NA`
[1] 2
> l$"NA"
[1] 2
> l[["NA"]]
[1] 2
> names(l)
[1] "NA"
......
--
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c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
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