[R] numeric to factor via lookup table
Noah Marconi
noah.marconi at noah-marconi.com
Fri Mar 28 21:52:26 CET 2014
Is this what you're going for?
factor(values, levels=mylevels[[1]], labels=mylevels[[2]])
[1] a b e e j
Levels: a b c d e f g h i j
On 2014-03-28 16:38, Jonathan Greenberg wrote:
> R-helpers:
>
> Hopefully this is an easy one. Given a lookup table:
>
> mylevels <- data.frame(ID=1:10,code=letters[1:10])
>
> And a set of values (note these do not completely cover the mylevels
> range):
>
> values <- c(1,2,5,5,10)
>
> How do I convert values to a factor object, using the mylevels to
> define the correct levels (ID matches the values), and code is the
> label?
>
> --j
>
> --
> Jonathan A. Greenberg, PhD
> Assistant Professor
> Global Environmental Analysis and Remote Sensing (GEARS) Laboratory
> Department of Geography and Geographic Information Science
> University of Illinois at Urbana-Champaign
> 259 Computing Applications Building, MC-150
> 605 East Springfield Avenue
> Champaign, IL 61820-6371
> Phone: 217-300-1924
> http://www.geog.illinois.edu/~jgrn/
> AIM: jgrn307, MSN: jgrn307 at hotmail.com, Gchat: jgrn307, Skype: jgrn3007
>
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