[R] mean

Mark Myatt mark at myatt.demon.co.uk
Fri May 11 10:32:31 CEST 2001

luca laghi <llaghi at foodsci.unibo.it> writes:
> Greetings,
>a little question:
>if I heve got a matrix with 10 columns, how do I produce a 10 elements
>vector with the average of each column?
>Thank you,


        apply(mat, 2, mean)

The '2' indicates columns. You can specify arguments to the applied
function ...

        apply(mat, 2, mean, na.rm = TRUE)

I hope that helps.


Mark Myatt

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