Form a large matrix from n numbers of small matrices

Question

I am a new to MATLAB. I have generated n smaller matrices of numbers, say 3 x 1 by using a FOR loop. All the matrices are having random v

Answer 1

Do your really need the individual variables? Probably such a solution is simpler, using only one mmatrix:

M=zeros(40,40)
for idx=1:size(M,1)
   M(idx,:)=your_code_here()
end

Whenever you would have used M1 before, now use M(1,:) to get the first row of M