function a = HVclass(varargin)% constructor of the class HVDC% == HVDC ==global Settingsswitch nargin case 0  a.con = [];  a.n = 0;  a.bus1 = [];  a.bus2 = [];  a.v1 = [];  a.v2 = [];  a.dat = [];  a.Idc = [];  a.xr = [];  a.xi = [];  a.cosa = [];    a.cosg = [];   a.Sr = [];    a.Si = [];  a.Vrdc = [];  a.Vidc = [];  a.yr = [];     a.yi = [];   a.store = [];  a.u = [];  a.ncol = 29;  a.format = ['%4d %4d ',repmat('%8.4g ',1,26),'%2u'];  if Settings.matlab, a = class(a,'HVclass'); end case 1  if isa(varargin{1},'HVclass')    a = varargin{1};  else    error('Wrong argument type')  end otherwise  error('Wrong Number of input arguments')end