[ublas] Return type of 'mean_square'

Subject: [ublas] Return type of 'mean_square'
From: Joaquim Duran Comas (jdurancomas_at_[hidden])
Date: 2015-08-10 11:40:18

Hello,

Few days ago, I patched the function 'mean_square' for vectors and
matrices. Currently, the current return type of the function is AE::value_type.
To get better accuracy, is it better return double type than AE::value_type
(specially if it is an integuer)?

Joaquim Duran