RIDGELEN is the jRidges module of jLab.

 RIDGELEN  Wavelet ridge length expressed as number of full cycles.
    LEN=RIDGELEN(FR) determines the length of the ridges given by the
    ridge frequency FR, with LEN expressed as number of cycles completed
    along the ridge.  FR has units of radians per sample.
    LEN is a column vector of the same size as FR.  Each element of LEN 
    gives the number of cycles contained in the current ridge. 
    LEN=RIDGELEN(DT,FR) uses the sample interval DT in calculating the 
    ridge length.  DT has the default value DT=1.  In this case, FR is 
    expected to have units of radians per DT.
    'ridgelen --t' runs some tests.
    Usage: lr=ridgelen(fr);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2009--2018 J.M. Lilly --- type 'help jlab_license' for details

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