[R] SAS-like method of recoding variables?

[Chuck Cleland]

On 6/22/2009 2:27 PM, Mark Na wrote:
> Dear R-helpers,
> 
> I am helping a SAS user run some analyses in R that she cannot do in
> SAS and she is complaining about R's peculiar (to her!) way of
> recoding variables. In particular, she is wondering if there is an R
> package that allows this kind of SAS recoding:
> 
> IF TYPE='TRUCK' and count=12 THEN VEHICLES=TRUCK+((CAR+BIKE)/2.2);
> 
> Thanks for any help or suggestions you might be able to provide!

  If the variables are in a data frame called "mydf", she might do
something like this:

mydf$VEHICLE <- with(mydf, ifelse(TYPE=='TRUCK' & count==12,
                                  TRUCK+((CAR+BIKE)/2.2),
                                  NA))

or

mydf <- transform(mydf, VEHICLE = ifelse(TYPE=='TRUCK' & count==12,
                                         TRUCK+((CAR+BIKE)/2.2),
                                         NA))

> Mark Na
> 
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-- 
Chuck Cleland, Ph.D.
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