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); [k2,l2,theta2,phi2]=elldiff(4*3600,k,l,theta,phi,1e5); '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