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// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------
//! \addtogroup running_stat
//! @{
template<typename eT>
class arma_counter
{
public:
inline ~arma_counter();
inline arma_counter();
inline const arma_counter& operator++();
inline void operator++(int);
inline void reset();
inline eT value() const;
inline eT value_plus_1() const;
inline eT value_minus_1() const;
private:
arma_aligned eT d_count;
arma_aligned uword i_count;
};
//! Class for keeping statistics of a continuously sampled process / signal.
//! Useful if the storage of individual samples is not necessary or desired.
//! Also useful if the number of samples is not known beforehand or exceeds
//! available memory.
template<typename eT>
class running_stat
{
public:
typedef typename get_pod_type<eT>::result T;
inline ~running_stat();
inline running_stat();
inline void operator() (const T sample);
inline void operator() (const std::complex<T>& sample);
inline void reset();
inline eT mean() const;
inline T var (const uword norm_type = 0) const;
inline T stddev(const uword norm_type = 0) const;
inline eT min() const;
inline eT max() const;
inline eT range() const;
inline T count() const;
//
//
private:
arma_aligned arma_counter<T> counter;
arma_aligned eT r_mean;
arma_aligned T r_var;
arma_aligned eT min_val;
arma_aligned eT max_val;
arma_aligned T min_val_norm;
arma_aligned T max_val_norm;
friend class running_stat_aux;
};
class running_stat_aux
{
public:
template<typename eT>
inline static void update_stats(running_stat<eT>& x, const eT sample, const typename arma_not_cx<eT>::result* junk = 0);
template<typename eT>
inline static void update_stats(running_stat<eT>& x, const std::complex<eT>& sample, const typename arma_not_cx<eT>::result* junk = 0);
template<typename eT>
inline static void update_stats(running_stat<eT>& x, const typename eT::value_type sample, const typename arma_cx_only<eT>::result* junk = 0);
template<typename eT>
inline static void update_stats(running_stat<eT>& x, const eT& sample, const typename arma_cx_only<eT>::result* junk = 0);
};
//! @}
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