Question: Multivariable functions


I am having trouble in defining multivariable functions. For instance, when I define the follow code:


 f:=(x_1,x_2,...,x_n) -> sum(x[i],i=1..n)

I get the error: Error, invalid operator parameter name.

How can I define this type of function when the number of variables is conditional on "n" ?

Thanks everybody!!



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