plotFFdB
========
```{function}  plotFFdB(nf2ff,varargin)
```
Full definition:
```{code-block} matlab
h = plotFFdB(nf2ff,varargin)
```

 plot far field pattern in dBi

input:
-  nf2ff:      output of CalcNF2FF

variable input:
-  'freq_index':   use the given frequency index, see nf2ff.freq
                   default is 1
-  'xaxis':        'phi' (default) or 'theta'
-  'param':        array positions of parametric plot
                   if xaxis='phi', theta is parameter, and vice versa
                   default is 1

example:

    plotFFdB(nf2ff, 'freq_index', 2, ...
                    'xaxis', 'phi', 'param', [1 46 91])

see examples/NF2FF/infDipol.m

See also CalcNF2FF, plotFF3D, polarFF



-----------------------
author: Thorsten Liebig, Stefan Mahr