Re: [R] list structure question

From: Prof Brian Ripley <>
Date: Fri 02 Jul 2004 - 01:39:03 EST

?mapply, but I think what you are doing is as good as anything.

On Thu, 1 Jul 2004, Rajarshi Guha wrote:

> I have a list in which element is a vector (all of the same length and
> all numeric). I want to find the mean of the first elements of the
> vectors, the mean of the second elements of the vectors and so on.
> Currently I convert the list to a data.frame and apply rowMeans(). But
> is there a way to to do this directly on the list? I seem to recall a
> post in which there was such a function (or expression) but I just cant
> seem to find it.
> Could somebody point me in the right direction?

Brian D. Ripley,        
Professor of Applied Statistics,
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Fri Jul 02 01:43:14 2004

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