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#ifndef PROJECTIONHISTORY_H
#define PROJECTIONHISTORY_H
#include <vector>
#include <armadillo>
#include <nod.hpp>
class ProjectionHistory
{
public:
enum ObserverType {
ObserverCurrent,
ObserverDiffPrevious,
ObserverDiffFirst
};
ProjectionHistory(const arma::mat &X, const arma::uvec &cpIndices);
const arma::mat &Y() const { return m_Y; }
const arma::mat &firstY() const { return m_firstY; }
const arma::mat &prevY() const { return m_prevY; }
const arma::mat &unreliability() const { return m_unreliability; }
const arma::uvec &cpIndices() const { return m_cpIndices; }
const arma::uvec &rpIndices() const { return m_rpIndices; }
bool hasFirst() const { return m_hasFirst; }
bool hasPrev() const { return m_hasPrev; }
void undo();
void reset();
nod::signal<void()> undoPerformed, resetPerformed;
nod::signal<void(const arma::mat &)> currentMapChanged;
nod::signal<void(const arma::vec &, bool)> valuesChanged,
cpValuesChanged, rpValuesChanged;
nod::signal<void(const arma::mat &)> mapRewound;
nod::signal<void(const arma::vec &)> valuesRewound,
cpValuesRewound, rpValuesRewound;
nod::signal<void(const std::vector<bool> &)> cpSelectionChanged,
rpSelectionChanged, selectionChanged;
void addMap(const arma::mat &Y);
bool setType(ObserverType type);
void setCPSelection(const std::vector<bool> &cpSelection);
void setRPSelection(const std::vector<bool> &rpSelection);
void setSelection(const std::vector<bool> &selection);
void setRewind(double t);
private:
bool emitValuesChanged() const;
void updateUnreliability();
void cpSelectionPostProcess();
void rpSelectionPostProcess();
ObserverType m_type;
arma::mat m_X, m_Y, m_firstY, m_prevY;
arma::mat m_distX, m_distY, m_firstDistY, m_prevDistY;
arma::mat m_unreliability;
arma::uvec m_cpIndices, m_rpIndices;
bool m_cpSelectionEmpty, m_rpSelectionEmpty;
std::vector<int> m_cpSelection, m_rpSelection;
std::vector<bool> m_selection;
// alpha(i, j): the influence CP j has on RP i
void computeAlphas();
arma::mat m_alphas, m_influences;
// TODO: one per implemented measure
arma::vec m_values, m_firstValues, m_prevValues;
bool m_hasFirst, m_hasPrev;
};
#endif // PROJECTIONHISTORY_H
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