integer
G??ran Brostr??m wrote:
On Tue, Nov 02, 2004 at 11:36:27AM +0100, Uwe Ligges wrote:
Ludovic Tambour wrote:
Hello, I need to use "R" to determine parameters which are integers. How I can do this, please ?
What so you mean with "parameters"? In which context? To check whether a numeric vector "x" contains only integers, you can try all.equal(as.integer(x), x)
I don't think so:
x <- as.double(c(1, 2)) y <- as.integer(c(1, 2)) all.equal(x, y)
[1] TRUE But,
identical(x, y)
[1] FALSE
[The story was completely different from the stuff I guessed, so all further communication related to this thread is "academic".] G??ran, yes, as expected.
On the other hand, why not use
is.integer(x)
[1] FALSE
is.integer(y)
[1] TRUE because I think that a numeric vector can't have a mix of integer and non-integer elements. With a list it's a different story.
Yes. My guees was that the asker tried to identify integers such as 2, 3 in contrast to 2.1, 3.1, ...and you won't know it by looking at R's storage mode (my guess was that the asker was not interested in the storage mode, but in the nature of the numbers!). Note that is.integer(1) is FALSE!!! The given usage of all.equal() helps to identify 1 as an integer, but not 1.1... Uwe
G??ran