Matlab - como hacer un recorrido de una matriz nxn, es decir que me reproduzca los mismos valores n veces

>> n=3;   w = sym('ab%d', [1 n]),   u=diag(-w,-1), v=diag(-w,1), A=u+v

w =

[ ab1, ab2, ab3]

u =

[    0,    0,    0, 0]

[ -ab1,    0,    0, 0]

[    0, -ab2,    0, 0]

[    0,    0, -ab3, 0]

v =

[ 0, -ab1,    0,    0]

[ 0,    0, -ab2,    0]

[ 0,    0,    0, -ab3]

[ 0,    0,    0,    0]

A =

[    0, -ab1,    0,    0]

[ -ab1,    0, -ab2,    0]

[    0, -ab2,    0, -ab3]

[    0,    0, -ab3,    0]

>> n=5;   w = sym('ab%d', [1 n]),   u=diag(-w,-1), v=diag(-w,1), A=u+v

w =

[ ab1, ab2, ab3, ab4, ab5]

u =

[    0,    0,    0,    0,    0, 0]

[ -ab1,    0,    0,    0,    0, 0]

[    0, -ab2,    0,    0,    0, 0]

[    0,    0, -ab3,    0,    0, 0]

[    0,    0,    0, -ab4,    0, 0]

[    0,    0,    0,    0, -ab5, 0]

v =

[ 0, -ab1,    0,    0,    0,    0]

[ 0,    0, -ab2,    0,    0,    0]

[ 0,    0,    0, -ab3,    0,    0]

[ 0,    0,    0,    0, -ab4,    0]

[ 0,    0,    0,    0,    0, -ab5]

[ 0,    0,    0,    0,    0,    0]

A =

[    0, -ab1,    0,    0,    0,    0]

[ -ab1,    0, -ab2,    0,    0,    0]

[    0, -ab2,    0, -ab3,    0,    0]

[    0,    0, -ab3,    0, -ab4,    0]

[    0,    0,    0, -ab4,    0, -ab5]

[    0,    0,    0,    0, -ab5,    0]

>> n=4;   w = sym('ab%d', [1 n]),   u=diag(-w,-1), v=diag(-w,1), A=(u+v)/2

w =

[ ab1, ab2, ab3, ab4]

u =

[    0,    0,    0,    0, 0]

[ -ab1,    0,    0,    0, 0]

[    0, -ab2,    0,    0, 0]

[    0,    0, -ab3,    0, 0]

[    0,    0,    0, -ab4, 0]

v =

[ 0, -ab1,    0,    0,    0]

[ 0,    0, -ab2,    0,    0]

[ 0,    0,    0, -ab3,    0]

[ 0,    0,    0,    0, -ab4]

[ 0,    0,    0,    0,    0]

A =

[      0, -ab1/2,      0,      0,      0]

[ -ab1/2,      0, -ab2/2,      0,      0]

[      0, -ab2/2,      0, -ab3/2,      0]

[      0,      0, -ab3/2,      0, -ab4/2]

[      0,      0,      0, -ab4/2,      0]