build a block matrix from matrices

I am trying to build a block matrix from square diagonal matrices e.g. M{1,1},M{1,2},M{2,1}, and M{2,2} and I need to transfer them to a big matrix B such that:

B=[M{1,1} M{1,2}]
  [M{2,1},M{2,2}];

each M has the same dimension.. I appreciate any help..

Answer 1

[Walter Roberson]

B = cell2mat(M);

provided that the M are all the same size. (It will work in some other cases as well.)

[SALMA ALJAWI]

This is really helpful, thank you Walter..