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white_gaussian.hh
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// Copyright (C) 2010 EPITA Research and Development Laboratory (LRDE)
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//
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// This file is part of Olena.
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//
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// Olena is free software: you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation, version 2 of the License.
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//
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// Olena is distributed in the hope that it will be useful,
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// but 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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//
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// You should have received a copy of the GNU General Public License
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// along with Olena. If not, see <http://www.gnu.org/licenses/>.
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//
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// As a special exception, you may use this file as part of a free
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// software project without restriction. Specifically, if other files
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// instantiate templates or use macros or inline functions from this
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// file, or you compile this file and link it with other files to produce
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// an executable, this file does not by itself cause the resulting
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// executable to be covered by the GNU General Public License. This
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// exception does not however invalidate any other reasons why the
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// executable file might be covered by the GNU General Public License.
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#ifndef MLN_FUN_N2V_WHITE_GAUSSIAN_HH
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# define MLN_FUN_N2V_WHITE_GAUSSIAN_HH
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# include <cstdlib>
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# include <ctime>
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# include <mln/core/concept/function.hh>
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# include <mln/math/sqrt.hh>
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namespace
mln
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{
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namespace
fun
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{
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namespace
n2v
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{
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template
<
typename
V>
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struct
white_gaussian
:
Function_n2v
< white_gaussian<V> >
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{
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typedef
V
result
;
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white_gaussian
(
double
sigma_);
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V
operator()
()
const
;
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double
sigma
;
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};
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# ifndef MLN_INCLUDE_ONLY
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template
<
typename
V>
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white_gaussian<V>::white_gaussian
(
double
sigma_)
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: sigma(sigma_)
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{
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srand(time(0));
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}
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template
<
typename
V>
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V
white_gaussian<V>::operator()
()
const
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{
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double
X = 0;
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for
(
int
i = 1; i < 50; ++i)
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{
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double
U = rand() / (
float
)RAND_MAX;
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X = X + U;
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}
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X = X - 25.f;
/* set mean to 0 */
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X = X *
math::sqrt
(12 / 50.f);
/* adjust variance to 1 */
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return
sigma * X;
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};
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# endif // ! MLN_INCLUDE_ONLY
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}
// end of namespace mln::fun::n2v
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}
// end of namespace mln::fun
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}
// end of namespace mln
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#endif // ! MLN_FUN_N2V_WHITE_GAUSSIAN_HH
mln
fun
n2v
white_gaussian.hh
Copyright (C) 2012 EPITA Research and Development Laboratory (LRDE)