Changing the Dimension of a Matrix

[Kiam Heong Kwa]

Hello,

Please forgive my ignorance. But is there a built-in command in Octave

that changes the dimension of  a matrix? For instance, say

A = [1, 2, 3, 4, 5, 6].

Is there a command to transform A into a matrix B with two rows and

three columns directly instead of doing the following?

B(1,:)=A(1:3);

B(2,:)=A(4:6);

Thank you very much!

Sincerely,

Kwa