kopia lustrzana https://github.com/vsamy/DiFipp
126 wiersze
3.9 KiB
C++
126 wiersze
3.9 KiB
C++
#include "msfc/filter/GenericFilter.h"
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#include "msfc/logging.h"
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namespace msfc {
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namespace filt {
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GenericFilter::GenericFilter(size_t nData)
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// : m_filteredData(nData, order)
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// , m_rawData(nData, order)
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{
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}
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GenericFilter::GenericFilter(size_t nData, const std::vector<double>& aCoeff, const std::vector<double>& bCoeff)
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: m_aCoeff(aCoeff)
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, m_bCoeff(bCoeff)
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, m_filteredData(aCoeff.size())
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, m_rawData(bCoeff.size())
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{
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assert(aCoeff.size() > 0);
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assert(bCoeff.size() > 0);
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normalize();
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}
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void GenericFilter::setNData(size_t nData)
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{
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// m_filteredData.resize(nData, m_filteredData.cols());
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// m_rawData.resize(nData, nData.cols());
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}
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void GenericFilter::setCoeff(const std::vector<double>& aCoeff, const std::vector<double>& bCoeff)
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{
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assert(aCoeff.size() > 0);
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assert(bCoeff.size() > 0);
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m_nACoeffFilteredData = 0;
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m_nBCoeffFilteredData = 0;
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m_aCoeff = aCoeff;
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m_bCoeff = bCoeff;
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m_filteredData.resize(aCoeff.size());
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m_rawData.resize(bCoeff.size());
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normalize();
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}
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void GenericFilter::getCoeff(std::vector<double>& aCoeff, std::vector<double>& bCoeff) const noexcept
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{
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aCoeff = m_aCoeff;
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bCoeff = m_bCoeff;
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}
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// bool GenericFilter::stepFilter(const Eigen::VectorXd& data)
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// {
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// if (m_filteredData.rows() != data.size()) {
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// LOG_ERROR("Bad data size. Expected vector of size " << m_filteredData.rows() << ", got a vector of size " << data.size());
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// return false;
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// }
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// if (m_nFilteredData == 0) {
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// m_rawData.row(0) = data;
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// m_filteredData.row(0).noalias() = m_bCoeff(0) * data;
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// ++m_nFilteredData;
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// } else if (m_nFilteredData < m_order) {
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// m_filteredData.row(m_nFilteredData).noalias() = m_bCoeff(0) * data;
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// for (size_t i = 1; i <= m_nFilteredData; ++i) {
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// m_filteredData.row(m_nFilteredData).noalias() += m_bCoeff(i) * m_rawData.row(i - 1);
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// }
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// ++m_nFilteredData;
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// }
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// if (m_nFilteredData >= m_order) {
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// } else {
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// for (size_t i = 0; i < m_nFilteredData; ++i) {
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// }
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// ++m_nFilteredData;
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// }
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// }
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// https://stackoverflow.com/questions/50511549/meaning-of-rational-transfer-function-underlying-matlab-filter-or-scipy-signal-f
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bool GenericFilter::stepFilter(double data)
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{
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double filtData;
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for (size_t i = 0; i < m_nBCoeffFilteredData; ++i)
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filtData += m_bCoeff[i] * m_rawData[m_nBCoeffFilteredData - i];
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for (size_t i = 1; i < m_nACoeffFilteredData; ++i)
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filtData -= m_aCoeff[i] * m_filteredData[m_nACoeffFilteredData - i];
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m_filteredData[m_nACoeffFilteredData] = filtData;
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m_rawData[m_nBCoeffFilteredData] = data;
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++m_nACoeffFilteredData;
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++m_nBCoeffFilteredData;
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if (m_nACoeffFilteredData == m_filteredData.size()) {
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double* fd = m_filteredData.data();
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for (size_t i = 0; i < m_filteredData.size() - 1; ++i)
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*(fd) = *(++fd);
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--m_nACoeffFilteredData;
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}
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if (m_nBCoeffFilteredData == m_rawData.size()) {
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double* rd = m_rawData.data();
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for (size_t i = 0; i < m_rawData.size() - 1; ++i)
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*(rd) = *(++rd);
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--m_nBCoeffFilteredData;
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}
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}
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void GenericFilter::normalize()
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{
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double a0 = m_aCoeff.front();
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if (std::abs(a0) < 1e-6) // Divide by zero
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LOG_ERROR_AND_THROW(std::invalid_argument, "By filtering value for coefficient a0. Should be superior to 1e-6");
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for (double& a : m_aCoeff)
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a /= a0;
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for (double& b : m_bCoeff)
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b /= a0;
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}
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} // namespace filt
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} // namespace msfc
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