try this:
apply(sapply(basic_map, function(x)tapply(df$Value, df$Book, sum)[x]), 2, sum)
On 19/12/2007, Kondamani, Arjun (GMI - NY Corporate Bonds)
<[EMAIL PROTECTED]> wrote:
> Suppose I have:
>
> Book Value
> A 10
> B 11
> C 9
> D 8
> A 12
> C 4
> D 5
> B 7
>
> I want to summarize above not by Book but by groupings of Books as in
> (below)
>
> I have a list ... basic_map <- list(c("A",B"),c("C,D"))
> Big_names <- c("A1", "A2")
> Names(basic_map) <- big_names
>
> So I want to get :
>
> A1 40
> A2 26
>
> How do I use tapply AND the list to get my custom groupings?
>
> thx
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