How to position groups of matrices inside a bigger matrix

I have a program in which I have some matrices of varying size that runs through a piece of code, for the current moment i only have two matrices. What i want to know is how would i place the matrices 'M' in a bigger matrix of zeros in a way that the values always stay in the diagonal and the rest of the matrices are zeros. So, for example if a have two matrices with size 4x4 the matrix would be a 8x8 matrix with [1:4,1:4] and [5:8,5:8] being values and the rest zeros. I want to do it in a way that i can do it for n-matrices. Here is the code i use.

for iter=1:2
    D=Stations{iter};
    n=length(D);
    c=[0;0;0;0];
    rowvector=ones(1,n);
    dt0=rowvector
    dn=sqrt((D(1,:)-m0(2)).^2+(D(2,:)-m0(3)).^2+(D(3,:)-m0(4)).^2);
    dtx = -(D(1,:)-m0(2))./(v.*dn);
    dty = -(D(2,:)-m0(3))./(v.*dn);
    dtz = -(D(3,:)-m0(4))./(v.*dn);
    M=[dt0; dtx; dty; dtz];
end

'Stations' is a cell array i use to store the different matrices

[Bob Thompson]

Does the code work? If not what kind of errors do you get?

Will your matrices always be square?

[Feliciano Döring]

The code works fine, The matrices will have varying size and dont always have to be square

Answer 1

[Siyu Guo]

blkdiag function is the tool you are looking for. Help it in MATLAB. Note you can use a loop within which the function is called iteratively to cope with n sub-matrices.

[Feliciano Döring]

Thanks! that is what i was looking for!