zero_crossing_positions()

std::vector< size_t > MayaFlux::Kinesis::Discrete::zero_crossing_positions	(	std::span< const double >	data,
		double	threshold = 0.0
	)

Sample indices of zero crossings in the full span.

Note

Produces sparse output; not vectorisable or suitable for compute kernels.

Parameters

data	Input span
threshold	Crossing threshold (default: 0.0)

Returns

Sorted sample indices where sign changes occur

Definition at line 634 of file Analysis.cpp.

{
    std::vector<size_t> pos;
    pos.reserve(data.size() / 4);
    for (size_t i = 1; i < data.size(); ++i) {
        if ((data[i] >= threshold) != (data[i - 1] >= threshold))
            pos.push_back(i);
    }
    pos.shrink_to_fit();
    return pos;
}

References zero_crossing_positions().

Referenced by MayaFlux::Yantra::extract_zero_crossings(), and zero_crossing_positions().

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