database_doc: getdbopts

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### 4.2 Function getdbopts for retrieving options in ’database’

This function is internally called by the functions of ’database’.

Function File: getdbopts (options, parname)
Function File: getdbopts (options, parname, default)

  Return a specific setting from a structure created by `setdbopts`. If parname is not a field of the options structure, return default if supplied, otherwise return an empty matrix.

  (This function uses the code of Octaves ’optimget’ function.)