[R] external variable by inside-function routines modifications

[devol]

Dear all,

  could you please advice whether it is possible somehow to modify an
external (from the point of some function view) variable by some
function-internal operators. For example

> var=1
> foo<-function(var){var=var+1}
> foo(var)
> var
[1] 1

but the goal is to get the var equal to 2 in this specific case.

Thanks!
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