85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
//
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// PAA.h
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// FastDTW-x
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//
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// Created by Melo Yao on 12/5/13.
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// Copyright (c) 2013 melo.yao. All rights reserved.
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//
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#ifndef __FastDTW_x__PAA__
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#define __FastDTW_x__PAA__
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#include "Foundation.h"
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#include <vector>
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#include "TimeSeries.h"
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#include "FDAssert.h"
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#include <cmath>
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FD_NS_START
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template <typename ValueType,JInt nDimension>
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class PAA : public TimeSeries<ValueType, nDimension>
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{
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vector<JInt> _aggPtSize;
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JInt _originalLength;
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public:
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PAA(const TimeSeries<ValueType,nDimension>& ts, JInt shrunkSize):TimeSeries<ValueType, nDimension>(), _originalLength(ts.size()),_aggPtSize(shrunkSize)
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{
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FDASSERT(shrunkSize>0 && shrunkSize <= ts.size(),"ERROR: The size of an aggregate representation must be greater than zero and \nno larger than the original time series. (shrunkSize=%ld , origSize=%ld).",shrunkSize,ts.size());
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// Ensures that the data structure storing the time series will not need
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// to be expanded more than once. (not necessary, for optimization)
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TimeSeries<ValueType,nDimension>::setMaxCapacity(shrunkSize);
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TimeSeries<ValueType,nDimension>::setLabels(*ts.getLabels());
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JDouble reducedPtSize = ts.size()/(JDouble)shrunkSize;
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JInt ptToReadFrom(0);
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JInt ptToReadTo;
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while (ptToReadFrom < ts.size()) {
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ptToReadTo = (JInt)round(reducedPtSize*(TimeSeries<ValueType,nDimension>::size()+1)) -1;
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JInt ptsToRead = ptToReadTo - ptToReadFrom + 1;
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JDouble timeSum(0.0);
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ValueType measurementSums[nDimension];
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fill(measurementSums, measurementSums+nDimension, 0);
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for (JInt pt = ptToReadFrom; pt<=ptToReadTo; ++pt) {
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const MeasurementVector<ValueType, nDimension> *currentPoint = ts.getMeasurementVector(pt);
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timeSum += ts.getTimeAtNthPoint(pt);
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for (JInt dim = 0; dim<ts.numOfDimensions(); ++dim) {
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measurementSums[dim] += (*currentPoint)[dim];
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}
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}
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// Determine the average value over the range ptToReadFrom...ptToReadFrom.
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timeSum = timeSum / ptsToRead;
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for (JInt dim = 0; dim<ts.numOfDimensions(); dim++) {
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measurementSums[dim] = measurementSums[dim] / ptsToRead;
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}
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_aggPtSize[TimeSeries<ValueType,nDimension>::size()] = ptsToRead;
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TimeSeries<ValueType,nDimension>::addLast(timeSum,TimeSeriesPoint<ValueType,nDimension>(measurementSums));
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ptToReadFrom = ptToReadTo + 1;
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}
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}
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JInt originalSize() const
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{
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return _originalLength;
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}
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JInt aggregatePtSize(JInt ptIndex) const
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{
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return _aggPtSize[ptIndex];
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}
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void print(ostream& stream) const
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{
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TimeSeries<ValueType, nDimension>::print(stream);
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stream<<"original len:"<<_originalLength<<"\n";
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for(JInt i = 0;i<_aggPtSize.size();++i)
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{
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stream<<_aggPtSize[i] << ",";
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}
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stream<<"\n";
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}
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};
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FD_NS_END
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#endif /* defined(__FastDTW_x__PAA__) */
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