On Jan 18, 2011, at 5:25 PM, kurt_h...@nps.gov wrote:
Greetings
I have a bunch of NAs in a column of categorical variables
designating
the size classes (e.g., smallest to largest: 1,2,3,4) of cave
crickets.
I'd like to substitute "U" (for unknown) for the NAs. Can anyone
give me
an idea how to do this? Thanks in advance.
> vect=factor(c(1,2,3,4,NA))
> vect
[1] 1 2 3 4 <NA>
Levels: 1 2 3 4
> levels(vect) <- c(levels(vect), "U")
> vect[is.na(vect)] <- "U"
>
> vect
[1] 1 2 3 4 U
Levels: 1 2 3 4 U
--
David.
Cheers
Kurt
***************************************************************
Kurt Lewis Helf, Ph.D.
Ecologist
EEO Counselor
National Park Service
Cumberland Piedmont Network
P.O. Box 8
Mammoth Cave, KY 42259
Ph: 270-758-2163
Lab: 270-758-2151
Fax: 270-758-2609
****************************************************************
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The scientific tradition is distinguished from the pre-scientific
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-Karl Popper
...consider yourself a guest in the home of other creatures as
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CUPN Cave Aquatic Biota Monitoring Website:
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