[R] Converting factors to bounded random numerical data

[jim holtman]

You need to include how many random numbers you want to create; you
are asking for only 1, that is why they are are the same.  You
probably want something like:

a$Z<-ifelse(a$Z=="L"
    ,sample(1:4, nrow(a), TRUE)
    ,ifelse(a$Z=="M"
        ,sample(5:9, nrow(a), TRUE)
        ,ifelse(a$Z=="U"
            ,sample(10:12, nrow(a), TRUE)
            , -42  # you had a character which would have converted
everything to character
            )
        )
    )

On Wed, Oct 10, 2012 at 8:36 PM, KoopaTrooper <ncooper1 at tulane.edu> wrote:
> I have a data set (a) with three columns (X,Y,Z). The first 2 columns are
> numeric. The third (Z) is a factor with three levels A,B,C. I want to turn
> each A into a different random number between 1 and 4, each B into a
> different random number between 5 and 8, etc.
>
> I tried this:
>
> a$Z<-ifelse(a$Z=="L",sample(1:4,1),ifelse(a$Z=="M",sample(5:9,1),ifelse(a$Z=="U",sample(10:12,1),"")
>
> and it almost worked but changed all the "A's" into the same random number.
> I need a different random number for each A. Ideas?
>
> Thanks,
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Converting-factors-to-bounded-random-numerical-data-tp4645801.html
> Sent from the R help mailing list archive at Nabble.com.
>
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-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.