ELLROSSBY is the jEllipse module of jLab.

 ELLROSSBY  Ellipse Rossby number, for oceanographic applications.
    RO=ELLROSSBY(LAT,LAMBDA,OMEGA) returns the ellipse Rossby number RO 
    for an ellipse with linearity LAMBDA and joint instantaneous frequency
    OMEGA, in radians per day, at latitude LAT.
    The magnitude of the ellipse Rossby number is |RO|=|OMEGA/F| where F
    is the signed Coriolis frequency at latitude LAT.  
    The sign of RO is SIGN(RO)=-SIGN(LAMBDA/F), so that RO is positive for
    cyclones, and negative for anticyclones, in both hemispheres. 
    For circular eddies, this definition of Rossby number is equivalent to
    RO=-V/(R*F), where R is the radial distance to the eddy center and V is
    the signed instantaneous azimuthal velocity. 
    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, LAMBDA and OMEGA may be cell arrays and LAT a constant.
    'ellrossby --t' runs a test.
    Usage: ro=ellrossby(lat,lambda,omega);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2011--2016 J.M. Lilly --- type 'help jlab_license' for details

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