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...fooModifier, R will throw an error b/c it can't find the "foo" object. I have to say that for someone coming from languages that have pointers and/or references, it's really frustrating that R fails to allow one to have direct access to the objects' memory space. Onyway, one workaround would be to pass in the whole fooStack object and the index of the elt that you want to modify to the fooModifier fn, but I'd rather not have to pass the whole thing in. Any suggestions? Thanks! Peter Waltman