Sorry...I didn't realize that there were such distinct lines drawn
around core vs contributed packages. I merely thought that r-help put
those with questions in touch with others who might have used or
authored a package and experienced the same problem. I didn't intend to
make more work for you or anyone else on this list. In fact, I was
merely trying to be thorough and exact, including a note with the
version of R and the OS I am running. I have no idea what packages
others have installed in their R environments. For future reference, am
I to assume that no contributed packages should be implicated in
resolving a problem?
Peter Dalgaard wrote:
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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