ELLROSSBY is the jEllipse module of jLab.

 ELLROSSBY  Ellipse Rossby number, for oceanographic applications.
    RO=ELLROSSBY(LAT,XI,OMEGA) returns the vorticity Rossby number RO for 
    an ellipse with signed circularity XI and joint instantaneous
    frequency OMEGA, given in radians per day, at latitude LAT.
    The vorticity Rossby number is defined as RO = (2/XI)*OMEGA/F where F
    is the signed Coriolis frequency at latitude LAT.  
    For details, see Lilly and Perez-Brunius (2021b).
    For steady, non-precessing ellipses, RO will be positive for cyclonic
    motion and negative for anticyclonic motion in both hemispheres. 
    The input arguments may also be cell arrays of numeric arrays, all 
    having the same size.  RO will then be a similarly sized cell array.
    Alternatively, XI and OMEGA may be cell arrays and LAT a constant.
    'ellrossby --t' runs a test.
    Usage: ro=ellrossby(lat,xi,omega);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2011--2021 J.M. Lilly --- type 'help jlab_license' for details

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