SetCustomExcite
===============
```{function}  SetCustomExcite(FDTD,f0,funcStr)
```
Full definition:
```{code-block} matlab
function FDTD = SetCustomExcite(FDTD,f0,funcStr)
```

- f0 : nyquist rate
- funcStr : string describing the excitation function e(t)

see also SetSinusExcite SetGaussExcite

e.g for a ramped sinus excite...

    T = 1/f0;
    FDTD = SetCustomExcite(FDTD,1e9,..
    [ '(1-exp(-1*(t/' num2str(T) ')^2) ) * sin(2*pi*' num2str(f0) '*t)' ]);



-----------------------
author: Thorsten Liebig