simple matrix question

what is the easiest way to get from

x

x1 x2
[1,]  2  3
[2,]  3  2
[3,]  1  3
[4,]  1  4

the matrix xbar

xbar1

x1 x2
[1,] 1.75  3
[2,] 1.75  3
[3,] 1.75  3
[4,] 1.75  3

with the mean of the columns of x as values?

thanks

christoph

Christoph Lehmann <lehmann at puk.unibe.ch>
University Hospital of Clinical Psychiatry