InitFDTD
========
```{function}  InitFDTD(varargin)
```
Full definition:
```{code-block} matlab
function FDTD = InitFDTD(varargin)
```

Initialize 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



-----------------------
author: Thorsten Liebig (c) 2010-2013