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fm = meanfreq (spectrum, freq)
MEANFREQ Compute mean frequency of a signal.
FM = MEANFREQ (SPECTRUM, FREQ) computes the mean power frequency
of a signal with spectrum given by SPECTRUM, computed at
the frequencies given by FREQ, returning the mean power
frequency in FM.
FM is a weighted sum of the spectrum (sum of SPECTRUM * FREQ)
divided by a sum of SPECTRUM.
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