On 2011-07-25 10:51, "Dénes TÓTH" wrote:
Hi,
you provided a character vector as an example. I guess you meant something
like:
x<- factor(c("1","2","3","4","<1"))
# You can identify those elements with an "<" by ?grep or ?grepl:
indices<- grep("<",as.character(x))
# You can transform those elements by ?as.numeric
as.numeric(x[indices])
I fail to see what this is supposed to accomplish. It gives
as.numeric(x[indices])
#[1] 1
Try changing x to
x <- factor(c("1","2","3","4","<8"))
You'll still get
as.numeric(x[indices])
#[1] 1
?factor explains this.
Better just stick with a character vector to begin with.
Peter Ehlers
HTH,
Denes
Hi all,
I'm trying to identify a particular digit or value within a vector of
factors. Specifically, this is environmental data where in some cases the
minimum value reported is "<" a particular number (and I want to
manipulate
only these). For example:
x<-c("1","2","3","4","<1")
For a dataset that is hundreds or thousands of lines long, I'd like to
find
or identify only those that have a "<" symbol (R automatically stores the
entire vector in factor format due to these symbols when it imports the
data-I don't mind converting if necessary). Eventually, I'd like to divide
the number in half for these cases, but I think I have that coding lined
up
once I can just identify them from the stew.
I've exhausted help and net resources so far...
Thanks,
Ryan
--
Ryan Utz, Ph.D.
Aquatic Ecologist/STREON Scientist
National Ecological Observatory Network
Home/Cell: (724) 272-7769
Work: (720) 746-4844 ext. 2488
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