Add squared norm convenience function

Ronald Wampler <[email protected]>
Newsgroups gmane.comp.lib.boost.ublas
Message-ID <CAL3wmMP+DggaawnqrFjdE352_4TPpjTJeNj-Ho77UC4+-+YZkA@mail.gmail.com> 
Hi,

I was wondering if it would be possible to add a function to calculate
the squared norm? While it's easy to implement one's own version,
it occurs fairly frequently (e.g., in optimization problems) that it
would be nice to have. I would be happy to provide a patch if there is
interest.

Ron
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