* If the number of elements in \a this is 0, std::numeric_limits<double>::max() is returned.
* \return double - the value of the minimum norm, i.e.
* the minimal absolute value among values of \a this array (whatever its number of components).
* If the number of elements in \a this is 0, std::numeric_limits<double>::max() is returned.
* \return double - the value of the minimum norm, i.e.
* the minimal absolute value among values of \a this array (whatever its number of components).