"quiero generar n matrices llamadas M1,M2,M3, etc"
The MATLAB documentation states "A frequent use of the eval function is to create sets of variables such as A1, A2, ..., An, but this approach does not use the array processing power of MATLAB and is not recommended."
In fact your approach forces you into writing slow, complex, inefficient, obfuscated, buggy code that is hard to debug. Read this to know why:
It is very very unlikely that you need to do this anyway:
