82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
// -*- C++ -*-
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// Copyright (C) 2005-2015 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this library; see the file COPYING3. If not see
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// <http://www.gnu.org/licenses/>.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file sample_variance.hpp
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* Contains a function for calculating a sample variance
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*/
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#ifndef PB_DS_SAMPLE_VAR_HPP
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#define PB_DS_SAMPLE_VAR_HPP
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#include <list>
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#include <numeric>
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#include <math.h>
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#include <iterator>
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namespace __gnu_pbds
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{
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namespace test
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{
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namespace detail
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{
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#define PB_DS_VTYPE typename std::iterator_traits<It>::value_type
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template<typename It>
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PB_DS_VTYPE
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sample_variance(It b, It e, PB_DS_VTYPE sm)
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{
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PB_DS_VTYPE ss = 0;
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size_t num_res = 0;
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while (b != e)
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{
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const PB_DS_VTYPE d =* b - sm;
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ss += d* d;
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++num_res;
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++b;
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}
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if (num_res == 1)
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return 0;
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return ::sqrt(ss / (num_res - 1));
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}
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#undef PB_DS_VTYPE
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} // namespace detail
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} // namespace test
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} // namespace __gnu_pbds
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#endif
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