[R] Aggregate drops empty subsets

[Andrew Robinson]

Hi Sundar,

that's excellent - and a very educational answer.  

Thanks very much!

Andrew

> 
> Hi Andrew,
> 
> How about:
> 
> ui <- data.frame(burn = c("low", "high", "low", "low"),
>                  age = c("young", "old", "old", "young"),
>                  junk = c("a", "a", "b", "b"))
> ui2 <- do.call("table", ui)
> ui3 <- expand.grid(dimnames(ui2))
> ui3[paste(names(ui), collapse = ".")] <-
>   do.call("paste", c(ui3, sep = "."))
> ui3$count <- c(ui2)
> 
> I'm using R-1.9.0 on win2000.
> 
> --sundar
> 
> 

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