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Re place Values within vector using Translation vector

Greg Snow

Wed, Feb 18, 2009 1:34 PM

The call to replace is replacing the 1st 3 elements of a (your indexes in Trans_CR) with the values and leaving the 4-6 elements alone.  For what you want, try:

A <- Trans_Prob_values[ match(a, Trans_CR) ]

Hope this helps,

Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Christian Langkamp
> Sent: Wednesday, February 18, 2009 2:25 PM
> To: r-help at r-project.org
> Subject: [R] Re place Values within vector using Translation vector
> 
> 
> Dear everyone
> I would like to change values in vectors doing a translation. i.e. I
> have a
> start vector giving me the levels in one vector (numbers 1 to x -
> rating)
> and then I have a second vector giving me the values to be allocated
> (loss
> probabilities), but the number of potential rating classes and loss
> estimates is still subject to a lot of discussion.
> 
> Attached a simplified version of the problem (original has more values
> and
> needs to stay flexible, i.e. length of translation vector can change.
> 
> Trans_Prob_values<-c(0.005, 0.01, 0.1)
> Trans_CR<-c(1,2,3)
> a<-c(3,2,1,1,2,3)
> A<-replace(a, Trans_CR, Trans_Prob_values)
> A
> 
> This however produces
> [1] 0.005 0.010 0.100 1.000 2.000 3.000
> as opposed to the desired result.
> 
> 
> The help however says
> "replace replaces the values in x with indexes given in list by those
> given
> in values. If necessary, the values in values are recycled. " which in
> my
> view should be exactly doing the job intended above.
> 
> Constructions with nested ifelse statements and individual replacements
> are
> too cumbersome in my view.
> I searched for conditional replacement, vector replace, replace
> function and
> read the problems, but generally they have conditions like age>30 then
> x,
> not a direct translation of values.
> 
> If anyone has an idea, please do share it.
> Thanks
> Christian
> 
> --
> View this message in context: http://www.nabble.com/Replace-Values-
> within-vector-using-Translation-vector-tp22088527p22088527.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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Thread (3 messages)

Christian Langkamp Re place Values within vector using Translation vector Feb 18 Duncan Murdoch Re place Values within vector using Translation vector Feb 18 Greg Snow Re place Values within vector using Translation vector Feb 18