[R] Finding/identifying a value within a factor

[Daniel Malter]

b<-c("1","2","3","4","<1") 
grep('<',b)

HTH,
Daniel


Ryan Utz-2 wrote:
> 
> 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
> 
> 	[[alternative HTML version deleted]]
> 
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