functions.py 文件源码

def _significant_periods(periods, pgram):
    # Order ascending
    periods = periods[::-1]
    pgram = pgram[::-1]
    # Scale and extract significant
    pgram = (pgram - pgram.min()) / pgram.ptp()
    significant = argrelextrema(pgram, np.greater, order=5)
    return periods[significant], pgram[significant]