[R] numeric to factor via lookup table

[Noah Marconi]

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/
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> 
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