swap matrix positions in 3d matrices

How do I swap matrix positions? So if I wanted

 a(1,1,:)    = [1 2 3 4];
a(1,2,:)    = [1 1 1 1];

to become

 a(1,1,:)    = [1 1 1 1];
a(1,2,:)    = [1 2 3 4];

[Jan]

Such questions are discussed exhaustively in the Getting Started chapters of the documentation. It is recommended to read them.

Answer 1

[Andrei Bobrov]

a(1,1:2,:) = a(1,[2,1],:);

Answer 2

[Colin]

a(1,[1 2],:) = a(1,[2 1],:);