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[/] [openrisc/] [tags/] [gnu-dev/] [fsf-gcc-snapshot-1-mar-12/] [or1k-gcc/] [libstdc++-v3/] [testsuite/] [util/] [statistic/] [sample_variance.hpp] - Rev 847
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// -*- C++ -*- // Copyright (C) 2005, 2006, 2009 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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