ELLDIFF is the jEllipse module of jLab.

 ELLDIFF  Differentiation of modulated elliptical signals.
    Given the properties of a time-varying elliptical signal, ELLDIFF 
    finds the ellipse properties of the time derivative of that signal.  
    [K2,L2,TH2,PHI2]=ELLDIFF(K,L,TH,PHI) where the input arguments
    specify a time-varying ellipse of the complex-valued time series 
    Z=X+iY, returns the ellipse parameters for the associated time-
    varing ellipse of the first central difference of Z.  
    K and L are the input ellipse amplitude and linearity, respectively,
    while TH and PHI are its orientation and orbital phase.  The output
    arguments are the same parameters for the differentiated ellipse.
    [...]=ELLDIFF(DT,...) optionally specifies a time-step of DT
    (default=1) for the differentiation. 
    [...]=ELLDIFF(...,FACT) optionally multiplies the output amplitudes
    by the scale factor FACT (default=1), e.g. for a unit conversion from 
    kilometers into centimeters.
    See also ELLPARAMS.
    Usage:  [k2,l2,theta2,phi2]=elldiff(k,l,theta,phi);
    'elldiff --t' runs a test
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2005--2015 J.M. Lilly --- type 'help jlab_license' for details    

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