ml-gsd/lib/algorithms/secondDerivative.js

Global Spectral Deconvolution

import { getMinMaxIntervalsDy } from "./getMinMaxIntervals.js";
import { getPeakFromIntervals } from "./getPeaksFromIntervals.js";
export function secondDerivative(input) {
    const { x, y, yData, dY, ddY, dX, yThreshold } = input;
    const minddY = [];
    const { intervalL, intervalR } = getMinMaxIntervalsDy(y, x, dY, dX);
    // By the intermediate value theorem We cannot find 2 consecutive maximum or minimum
    for (let i = 1; i < y.length - 1; ++i) {
        // Minimum in second derivative
        if (ddY[i] < ddY[i - 1] && ddY[i] < ddY[i + 1]) {
            minddY.push(i);
        }
    }
    return getPeakFromIntervals({
        minData: minddY,
        intervalL,
        intervalR,
        x,
        yData,
        yThreshold,
        ddY,
    });
}
//# sourceMappingURL=secondDerivative.js.map