find_peak_positions()

std::vector< size_t > MayaFlux::Yantra::find_peak_positions	(	std::span< const double >	data,
		double	threshold = 0.0,
		size_t	min_distance = 1
	)

Find actual peak positions in the signal.

Returns sample indices where local maxima occur above a threshold.

Parameters

data	Input data span
threshold	Minimum absolute value to be considered a peak
min_distance	Minimum samples between peaks (prevents clustering)

Returns

Vector of sample positions where peaks occur

Definition at line 237 of file AnalysisHelper.cpp.

{
    if (data.size() < 3) {
        return {};
    }
 
    std::vector<size_t> positions;
    positions.reserve(data.size() / 100);
 
    size_t last_peak = 0;
 
    for (size_t i = 1; i < data.size() - 1; ++i) {
        double abs_val = std::abs(data[i]);
 
        if (abs_val > threshold && abs_val >= std::abs(data[i - 1]) && abs_val >= std::abs(data[i + 1])) {
 
            if (positions.empty() || (i - last_peak) >= min_distance) {
                positions.push_back(i);
                last_peak = i;
            }
        }
    }
 
    positions.shrink_to_fit();
    return positions;
}

References find_peak_positions().

Referenced by MayaFlux::Yantra::EnergyAnalyzer< InputType, OutputType >::create_analysis_result(), and find_peak_positions().

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