I fail to understand the purpose of your post. The error message seems
clear enough: either your matrices are not all numeric or you may have data
frames among them with non-numeric columns. Have you checked either or both?

?is.matrix
?is.numeric

as in
lapply(s,is.matrix(x) && is.numeric(x))

(with slight caveats with factors).

-- Bert


On Wed, Jan 2, 2013 at 2:16 PM, eliza botto <eliza_botto@hotmail.com> wrote:

>
> dear useRs,
> i have a list containing 16 matrices. i want to calculate  the column mean
> of each of them.
> i tried
>  >sr <- lapply(s,function(x) colMeans(x, na.rm=TRUE))
> but i am getting the following error
> >Error in colMeans(x, na.rm = TRUE) : 'x' must be numeric
> can it be done in any other way? and why i am getting this error??
> thanks in advance..
> elisa
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>
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

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