Use cell arrays, or stack along the third dimension.
for loop=1:1:10
m=[a b c d]; % I assume this is only a place-holder for code.
m2{loop}=m; % Notice the curly braces, not parenthesis.
end
Or,
for loop=1:1:10
m=[a b c d]; % I assume this is only a place-holder for code.
m2(:,:loop)=m; % A 3D array. Each page is a matrix
end
Also note, that if your final array m2 will be much larger than this you will definitely want to pre-allocate the space.
