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function FDTD = InitFDTD(varargin)
% function FDTD = InitFDTD(varargin)
%
% Inititalize the FDTD data-structure.
%
% optional field arguments for usage with openEMS:
% NrTS: max. number of timesteps to simulate (e.g. default=1e9)
% EndCriteria: end criteria, e.g. 1e-5, simulations stops if energy has
% decayed by this value (<1e-4 is recommended, default=1e-5)
% MaxTime: max. real time in seconds to simulate
% OverSampling: nyquist oversampling of time domain dumps
% CoordSystem: choose coordinate system (0 Cartesian, 1 Cylindrical)
% MultiGrid: define a cylindrical sub-grid radius
% TimeStep: force to use a given timestep (dangerous!)
% TimeStepFactor: reduce the timestep by a given factor (>0 to <=1)
% TimeStepMethod: 1 or 3 chose timestep method (1=CFL, 3=Rennigs (default))
% CellConstantMaterial: set to 1 to assume a material is constant inside
% a cell (material probing in cell center)
%
% examples:
% %default init with 1e9 max. timesteps and -50dB end-criteria
% FDTD = InitFDTD();
%
% %init with 1e6 max. timesteps and -60dB end-criteria
% FDTD = InitFDTD('NrTS', 1e6, 'EndCriteria', 1e-6);
%
% %cylindrical FDTD simulation
% FDTD = InitFDTD('CoordSystem', 1);
%
% See also InitCSX
%
% openEMS matlab interface
% -----------------------
% author: Thorsten Liebig (c) 2010-2013
% default values
NrTS = 1e9;
endCrit = 1e-5;
% legacy support
if ((nargin==1) && (isnumeric(varargin{1})))
NrTS = varargin{1};
warning('openEMS:InitFDTD',['Syntax for InitFDTD has changed, use: "InitFDTD(''NrTS'', ' num2str(NrTS) ')" instead! Legacy support enabled.']);
elseif ((nargin>1) && (isnumeric(varargin{1})) && (isnumeric(varargin{2})))
NrTS = varargin{1};
endCrit = varargin{2};
varargin(1:2) = [];
warning('openEMS:InitFDTD',['Syntax for InitFDTD has changed, use: "InitFDTD(''NrTS'', ' num2str(NrTS) ', ''EndCriteria'', ' num2str(endCrit) ')" instead! Legacy support enabled.']);
end
for n=1:numel(varargin)/2
if strcmpi(varargin{2*n-1},'CoordSystem')==1
FDTD.ATTRIBUTE.CylinderCoords=varargin{2*n}==1;
elseif strcmpi(varargin{2*n-1},'NrTS')==1
NrTS=varargin{2*n};
elseif strcmpi(varargin{2*n-1},'EndCriteria')==1
endCrit=varargin{2*n};
else
FDTD.ATTRIBUTE.(varargin{2*n-1})=varargin{2*n};
end
end
FDTD.ATTRIBUTE.NumberOfTimesteps=NrTS;
FDTD.ATTRIBUTE.endCriteria=endCrit;
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