Mehdi, if you mean that you want to make variables Matrix1, Matrix2 etc. inside a loop, then I agree completely with Walter and Jan - it's just a bad idea.
However, if you mean that you want to print "Matrix 1", "Matrix 2" etc. then that's OK, and you could do something like this:
for k = 1:4
fprintf('Matrix %d = \n', k);
disp(rand(2));
end
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