
Return a data.frame with all the options that can be supplied to nloptr.
Source:R/nloptr.get.default.options.R
      nloptr.get.default.options.RdThis function returns a data.frame with all the options that can be supplied
to nloptr. The data.frame contains the default
values of the options and an explanation. A user-friendly way to show these
options is by using the function
nloptr.print.options.
Value
The return value contains a data.frame with the following
elements
- name
- name of the option 
- type
- type (numeric, logical, integer, character) 
- possible_values
- string explaining the values the option can take 
- default
- default value of the option (as a string) 
- is_termination_condition
- is this option part of the termination conditions? 
- description
- description of the option (taken from NLopt website if it's an option that is passed on to NLopt).