RIDGELEN is the jRidges module of jLab.

 RIDGELEN  Wavelet ridge length expressed as number of full cycles.
    LEN=RIDGELEN(IR,FR) determines the length of the ridges given by the
    ridge parameters IR and FR, with LEN expressed as number of cycles
    completed along the ridge.  FR has units of radians per sample.
    IR is an array of the ridge time indices, while FR is the frequency of 
    the wavelet transform value along the ridge, as output by RIDGEWALK. 
    LEN is a column vector of the same size as IR and FR.  Each element of
    LEN gives the number of cycles contained in the current ridge. 
    IR and FR can also be cell arrays of ridges, in which case the output
    LEN is also a cell array of the same size as the input variables.
    Sample interval
    LEN=RIDGELEN(DT,IR,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.
    If IR and FR are cell arrays, DT may either be a scalar or an array of
    length LENGTH(IR).
    RIDGELEN internally computes an ID that takes on a single value for all
    points in the same ridge.  If such an ID is already available, calling
    LEN=RIDGELEN(DT,ID,IR,FR) also works.  This form is used by RIDGEWALK.  
    'ridgelen --t' runs some tests.
    Usage: lr=ridgelen(ir,fr);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2009--2014 J.M. Lilly --- type 'help jlab_license' for details

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