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- // -*- C++ -*-
- // Copyright (C) 2005-2022 Free Software Foundation, Inc.
- //
- // This file is part of the GNU ISO C++ Library. This library is free
- // software; you can redistribute it and/or modify it under the terms
- // of the GNU General Public License as published by the Free Software
- // Foundation; either version 3, or (at your option) any later
- // version.
- // This library is distributed in the hope that it will be useful, but
- // WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- // General Public License for more details.
- // You should have received a copy of the GNU General Public License
- // along with this library; see the file COPYING3. If not see
- // <http://www.gnu.org/licenses/>.
- // Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
- // Permission to use, copy, modify, sell, and distribute this software
- // is hereby granted without fee, provided that the above copyright
- // notice appears in all copies, and that both that copyright notice
- // and this permission notice appear in supporting documentation. None
- // of the above authors, nor IBM Haifa Research Laboratories, make any
- // representation about the suitability of this software for any
- // purpose. It is provided "as is" without express or implied
- // warranty.
- /**
- * @file sample_variance.hpp
- * Contains a function for calculating a sample variance
- */
- #ifndef PB_DS_SAMPLE_VAR_HPP
- #define PB_DS_SAMPLE_VAR_HPP
- #include <list>
- #include <numeric>
- #include <math.h>
- #include <iterator>
- namespace __gnu_pbds
- {
- namespace test
- {
- namespace detail
- {
- #define PB_DS_VTYPE typename std::iterator_traits<It>::value_type
- template<typename It>
- PB_DS_VTYPE
- sample_variance(It b, It e, PB_DS_VTYPE sm)
- {
- PB_DS_VTYPE ss = 0;
- size_t num_res = 0;
- while (b != e)
- {
- const PB_DS_VTYPE d =* b - sm;
- ss += d* d;
- ++num_res;
- ++b;
- }
- if (num_res == 1)
- return 0;
- return ::sqrt(ss / (num_res - 1));
- }
- #undef PB_DS_VTYPE
- } // namespace detail
- } // namespace test
- } // namespace __gnu_pbds
- #endif
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