. mat a=1,2,3\4,5,6
. mat b=a'
. mat list a

a[2,3]
    c1  c2  c3
r1   1   2   3
r2   4   5   6

. mat list b

b[3,2]
    r1  r2
c1   1   4
c2   2   5
c3   3   6