5e11f978ed
2007-09-12 Benjamin Kosnik <bkoz@redhat.com> * include/ext/pb_ds/*: Change namespace pb_ds to __gnu_pbds. * docs/html/ext/pb_ds/*: Same. * testsuite/ext/pb_ds/*: Same. * testsuite/performance/ext/pb_ds/*: Same. * testsuite/util/*: Same. From-SVN: r128448
92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
// -*- C++ -*-
|
|
|
|
// Copyright (C) 2005, 2006 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 2, 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 COPYING. If not, write to
|
|
// the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
|
|
// MA 02111-1307, USA.
|
|
|
|
// As a special exception, you may use this file as part of a free
|
|
// software library without restriction. Specifically, if other files
|
|
// instantiate templates or use macros or inline functions from this
|
|
// file, or you compile this file and link it with other files to
|
|
// produce an executable, this file does not by itself cause the
|
|
// resulting executable to be covered by the GNU General Public
|
|
// License. This exception does not however invalidate any other
|
|
// reasons why the executable file might be covered by the GNU General
|
|
// Public License.
|
|
|
|
// 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
|
|
|