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Compute array directivity

returns the Directivity (dBi) of an array of antenna or microphone elements, `D`

= directivity(`array`

,`FREQ`

,`ANGLE`

)`array`

,
at frequencies specified by `FREQ`

and in angles of direction specified by
`ANGLE`

.

The integration used when computing array directivity has a minimum sampling grid of 0.1 degrees. If an array pattern has a beamwidth smaller than this, the directivity value will be inaccurate.

`directivity(___,`

plots the
array pattern with additional options specified by one or more `Name,Value`

)`Name,Value`

pair arguments.