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rms.h
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/******************************************************************************
The MIT License(MIT)
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
Copyright(c) 2021 John Wellbelove
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
#ifndef ETL_RMS_INCLUDED
#define ETL_RMS_INCLUDED
#include "platform.h"
#include "functional.h"
#include "type_traits.h"
#include <math.h>
#include <stdint.h>
namespace etl
{
namespace private_rms
{
//***************************************************************************
//***************************************************************************
template <typename TInput, typename TCalc>
struct rms_traits
{
typedef TCalc calc_t;
};
//***************************************************************************
//***************************************************************************
template <typename TCalc>
struct rms_traits<float, TCalc>
{
typedef float calc_t;
};
//***************************************************************************
//***************************************************************************
template <typename TCalc>
struct rms_traits<double, TCalc>
{
typedef double calc_t;
};
} // namespace private_rms
//***************************************************************************
//***************************************************************************
template <typename TInput, typename TCalc = TInput>
class rms
: public private_rms::rms_traits<TInput, TCalc>
, public etl::binary_function<TInput, TInput, void>
{
private:
typedef typename private_rms::rms_traits<TInput, TCalc>::calc_t calc_t;
public:
//*********************************
//*********************************
rms()
: recalculate(true)
{
clear();
}
//*********************************
//*********************************
template <typename TIterator>
rms(TIterator first, TIterator last)
: recalculate(true)
{
clear();
add(first, last);
}
//*********************************
//*********************************
void add(TInput value)
{
sum_of_squares += TCalc(value * value);
++counter;
recalculate = true;
}
//*********************************
//*********************************
template <typename TIterator>
void add(TIterator first, TIterator last)
{
while (first != last)
{
add(*first);
++first;
}
}
//*********************************
//*********************************
void operator()(TInput value)
{
add(value);
}
//*********************************
//*********************************
template <typename TIterator>
void operator()(TIterator first, TIterator last)
{
add(first, last);
}
//*********************************
//*********************************
double get_rms() const
{
if (recalculate)
{
rms_value = 0.0;
if (counter != 0)
{
double n = double(counter);
double mean_of_squares = sum_of_squares / n;
if (mean_of_squares > 0)
{
rms_value = sqrt(mean_of_squares);
}
}
recalculate = false;
}
return rms_value;
}
//*********************************
//*********************************
operator double() const
{
return get_rms();
}
//*********************************
//*********************************
size_t count() const
{
return size_t(counter);
}
//*********************************
//*********************************
void clear()
{
sum_of_squares = calc_t(0);
counter = 0U;
rms_value = 0.0;
recalculate = true;
}
private:
calc_t sum_of_squares;
uint32_t counter;
mutable double rms_value;
mutable bool recalculate;
};
} // namespace etl
#endif
etl::rms::add
void add(TInput value)
Add a pair of values.
Definition rms.h:110
etl::rms::add
void add(TIterator first, TIterator last)
Add a range.
Definition rms.h:121
etl::rms::operator()
void operator()(TInput value)
Definition rms.h:134
etl::rms::get_rms
double get_rms() const
Get the rms.
Definition rms.h:152
etl::rms::operator()
void operator()(TIterator first, TIterator last)
Definition rms.h:144
etl::rms::rms
rms(TIterator first, TIterator last)
Constructor.
Definition rms.h:100
etl::rms::clear
void clear()
Clear the histogram.
Definition rms.h:194
etl::rms::count
size_t count() const
Get the total number added entries.
Definition rms.h:186
etl::rms::rms
rms()
Constructor.
Definition rms.h:90
functional.h
math.h
etl
Definition absolute.h:40
platform.h
etl::binary_function
binary_function
Definition functional.h:192
etl::private_rms::rms_traits
Types for generic correlation.
Definition rms.h:50
etl::sqrt
Definition sqrt.h:48
type_traits.h