ELLRAD is the jEllipse module of jLab.

 ELLRAD  Average and instantaneous ellipse radius. 
    R=ELLRAD(KAPPA,LAMBDA,PHI,STR) where KAPPA and LAMBDA are the amplitude 
    and linearity of a time-varying ellise, and PHI is its time-varying 
    phase, returns various measures of the ellipse 'radius'.
    STR determines the radius quantity to be output.
        STR       Symbol     Description
       'geo'      RM         Geometric mean radius = SQRT(A*B)    
       'ave'      RBAR       Period-averaged distance from the origin          
       'ins'      RI         Instantaneous distance from the origin
    See Lilly and Gascard (2006) for details.
    If STR is omitted, the geometric mean radius is returned by default.
    RM=ELLRAD(KAPPA,LAMBDA) with PHI omitted also works for computing RM.
    Cell array input/output
    If ELLRAD is given cell array input, it returns cell array output.
    Thus KAPPA, LAMBDA, and PHI may each be cell arrays of the same size, 
    where each element in the cell array is a numerical array.  
    The output variables will be also cell arrays of this size.
    Usage:  rm=ellrad(kappa,lambda);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2005--2014 J.M. Lilly --- type 'help jlab_license' for details

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