On Thu, Mar 27, 2008 at 3:05 PM, Dimitris Rizopoulos
<[EMAIL PROTECTED]> wrote:
> try this:
>
> dat <- data.frame(x = rnorm(10), y = rexp(10), z = letters[1:10])
> colMeans(data.matrix(dat[sapply(dat, is.numeric)]))
Alternatively
> sapply(dat, mean)
x y z
-0.5260131 1.0523121 NA
Warning message:
In mean.default(X[[3L]], ...) :
argument is not numeric or logical: returning NA
If you don't like the warning message showing up you can wrap the
expression in suppressWarnings().
> Quoting Diogo André Alagador <[EMAIL PROTECTED]>:
>
> > Hi all,
> >
> > I would like to know if it is posible by, someway, to get colMeans from
> > a data.frame with numeric as well as character data, dispersed all over
> > the object. Note that I would like to get colMeans neglecting character
> > data.
> >
> > I am really in need of some function proceeding in that way…
> >
> > All the best
> >
> > Diogo André Alagador
> >
> > [[alternative HTML version deleted]]
> >
> >
>
>
>
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