//#include "StdAfx.h"
#include "OptimizerMethod.h"
using namespace std;
COptimizerMethod::COptimizerMethod(void)
{
	 m_fAmplitudeGain=1.2;
	 m_fDecreaseGain=0.5;
	 m_fStepAmplitudeMax=0.9;
	 m_fStepAmplitudeMin=1e-6;
}
COptimizerMethod::COptimizerMethod(float AmplitudeGain,float DecreaseGain,float StepAmplitudeMax)
{
	m_fAmplitudeGain=AmplitudeGain;
	m_fDecreaseGain=DecreaseGain;
	m_fStepAmplitudeMax=StepAmplitudeMax;
	m_fStepAmplitudeMin=1e-6;
}
COptimizerMethod::~COptimizerMethod(void)
{
	
}

float COptimizerMethod::RPPOP_DeltaStepSeek(double& CurrentErrorDif,double& PreErrorDif,double& PreDeltaStep)
{
	float AdjustStep;//最后結(jié)果，即本此調(diào)整步長(zhǎng)
	float DeltaStep;//步長(zhǎng)調(diào)整值的變化量
	if (CurrentErrorDif*PreErrorDif>0)//%誤差單調(diào)（上升或下降）
	{
		DeltaStep=min(float(m_fAmplitudeGain*PreDeltaStep),m_fStepAmplitudeMax);
		PreDeltaStep=DeltaStep;//;%步長(zhǎng)調(diào)整的幅值,當(dāng)前計(jì)算的結(jié)果傳出去下次用
		AdjustStep=-DeltaStep*sign(CurrentErrorDif);  
		PreErrorDif=CurrentErrorDif;//%為下一次準(zhǔn)備
	}	
	else if (CurrentErrorDif*PreErrorDif<0)//%誤差經(jīng)過(guò)極值
	{
		AdjustStep=-PreDeltaStep;
		PreDeltaStep=max(float(m_fDecreaseGain*PreDeltaStep),m_fStepAmplitudeMin);//%當(dāng)前計(jì)算的結(jié)果傳出去下次用    
		PreErrorDif=0;//關(guān)鍵在此處，必須把0傳出去
	}	
	else if (CurrentErrorDif*PreErrorDif==0)//%誤差曾經(jīng)過(guò)極值
	{
		AdjustStep=-sign(CurrentErrorDif)*PreDeltaStep;
		PreErrorDif=CurrentErrorDif;//%為下一次準(zhǔn)備
	}		
	return AdjustStep;
}
inline float COptimizerMethod::sign(double &number)
{
	float Sign=number>=0?1.0:-1.0;
	return Sign;
}