Re: [R] Any container in R?

From: Thomas Lumley <>
Date: Mon 01 Jan 2007 - 20:21:51 GMT

On Mon, 1 Jan 2007, Feng Qiu wrote:

> Hi Duncan:
> Thank you very much! I checked out unique(), it does exactly what I
> want. But I'm still curious about if R provides "STL"(standard template
> library).


Some things the STL does aren't needed in R, others are implemented differently, and others aren't implemented.

One particularly important example is iterators, which will often either happen invisibly due to vectorized operations or will be done with the *apply family of functions.

Your example could have been done either way. Using duplicated() is the vectorized approach; the apply approach would use tapply().

C++ is not terribly similar to R. A lot of the effort in STL is expended on allowing a piece of code to be used on different types (where appropriate). In R you have to expend effort on stopping a piece of code being used on different types (where inappropriate).


Thomas Lumley			Assoc. Professor, Biostatistics	University of Washington, Seattle

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