swap x and y axis in a matrix

I would like to swap x and y axis in a matrix with n rows and two columns.

I have [r1 r2] and I would like to convert it to [r2 r1]

Thanks in advance for any answers!

Answer 1

[Jos (10584)]

M = [1 10 ; 2 20 ; 3 30]
Mnew = M(:,[2 1]) % by far the easiest
New = fliplr(M)