[R] multiple summation

[Uwe Ligges]

Paolo Bulla wrote:

> Hello,
> I have to compute a multiple summation (not an integration because the 
> independent variables a
> are discrete) for all the values of a function of several variables f
> (x_1,...,x_n), that is
> 
> sum ... sum f(x_1,...,x_n)
> x_1     x_n
> 
> have you some suggestion? Is it possible?
> I know that for multiple integration there is the function adapt, but it has at 
> most n=20. In my case n depends on the dimension of the dataset and, hence, it 
> could be bigger.
> 
> Thank you,
> Paolo


I's try to vectorizing f() and apply it on the set of all permutations.

Uwe Ligges


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