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Re: acting on a matrix but ...


     Riccardo,

    I think that your question is related with the possibility of passing
parameters to functions by 'reference', instead of usual convention of passing
a copy of their values. In order to have a function changing (permanently) the
values of (some of) their arguments, you can use Unevaluated[argn] when
calling the funtion (argn is the argument you want to change).

    It's probably helpful to check out the description of the Unevaluated
operator in the Math book.
       Nuno.





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