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February 03, 2009

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While I wholeheartedly agree with the concept, the example is not very good. The only thing we learn from that function call is that if we use sd R calls a function (written in c or fortran) called sd, so we are back at the starting point.

Well, no, it mostly calls 'var' -- which is where you hit the .Internal call. If it hits a matrix or a data frame, it calls itself in a way that then calls 'var'.

Still true, mind you, that 'sd' calls 'var' which makes an .Internal call. I think these are mostly coded in C, but I really neither know nor want to know.

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