How to split a matrix

How can I split a 1200X2 matrix into three serial 400X2 matrices?

Answer 1

[Fangjun Jiang]

A=reshape(1:24,12,[]);

B1=A(1:4,:)
B2=A(5:8,:)
B3=A(9:12,:)

C=mat2cell(A,[4,4,4],2);
C{1}
C{:}