create_instrument_optGroups: Create opt group list for selectizeInput for instruments
Description
This function accepts the sector and id columns
of the data set and create a list of groups as required
by the selectizeInput optgroup functionality
Usage
create_instrument_optGroups(sector, id)
Value
a list of groups for sector/ id
as required by the selectizeInput optgroup functionality
Arguments
- sector
sector column
- id
id column