MATLAB: Cell and Mat problem

Question

A=[1 2;5 2]

B=[2 1;4 5]

I want this as

Ans:

C=[1 2 0 0

5 2 0 0

0 0 2 1

0 0 4 5]

Actualy I want to store matrixes in a single matrix (as given in Ans) because my prog generate 10 matrix.

Answer 1

You can use blkdiag:

>> A = [1,2;5,2];
>> B = [2,1;4,5];
>> blkdiag(A,B)
ans =
     1     2     0     0
     5     2     0     0
     0     0     2     1
     0     0     4     5

If you are generating those matrices in a loop, then you can simply put them into a cell array first:

>> N = 5;
>> C = cell(1,N);
>> for k = 1:N; C{k} = randi(9,2); end % <- your loop
>> blkdiag(C{:})
ans =
     1     2     0     0     0     0     0     0     0     0
     3     2     0     0     0     0     0     0     0     0
     0     0     3     1     0     0     0     0     0     0
     0     0     4     9     0     0     0     0     0     0
     0     0     0     0     9     5     0     0     0     0
     0     0     0     0     5     4     0     0     0     0
     0     0     0     0     0     0     9     2     0     0
     0     0     0     0     0     0     4     8     0     0
     0     0     0     0     0     0     0     0     4     4
     0     0     0     0     0     0     0     0     3     1