[R] Converting factors to bounded random numerical data

[KoopaTrooper]

I have a data set (a) with 3 columns (X,Y,Z). The first 2 columns are
numerical. The third column (Z) is a factor with three levels ("A","B","C").
What I want to do is turn each of the "A's" into different random numbers
between 1 and 4, "B's" into a random number between 5 and 8, etc.

I tried this:

a$Z<-ifelse(a$Z=="A",sample(1:4,1),ifelse(a$Z=="B",sample(5:9,1),ifelse(a$Z=="C",sample(10:12,1),"")

That almost worked but changed all the A's to the same random number. I want
a different random number for each "A". Ideas?









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