r - How to find the means of all columns of a matrix simultaneously -

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i have matrix , want find means of columns @ same time. can this? below data.

dta=matrix(c(11,12,10,9,15,8),nrow=2,ncol=3)

how find means of columns simultaneously.

function colmeans right that:

> colmeans(dta) [1] 11.5  9.5 11.5

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