[R] Odp: calculating mean of list components

Petr PIKAL petr.pikal at precheza.cz
Wed Dec 15 14:38:26 CET 2010


r-help-bounces at r-project.org napsal dne 15.12.2010 14:22:15:

> I get a list object from an iterative function.  I'm trying to figure 
> out the most efficient way to calculate the mean of one element, across 
> all components of the overall list.
> I've tried
> output <- mean (listobject[[1:5]]$element)

As nobody knows exact structure of your listobject there is probably no 
way to give you any reasonable answer.

what does

str(listobject) give you?

What is result of


I presume that you get something like

Error in listobject[[1:5]] : recursive indexing failed at level ...


> to get the mean of "element" in the first five components?
> It doesn't like the $.  I'm suspect one of the "apply" functions will 
> work, but again I've not had success
> Thanks a bunch.
> J
> ----
> Jim Maas
> University of East Anglia
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