Uses the string from the select_choices_or_calculations
for the meta data to create a matrix of codes and their mapped
labels.
fieldChoiceMapping(object, field_name, ...)# S3 method for character
fieldChoiceMapping(object, field_name, ...)
# S3 method for redcapApiConnection
fieldChoiceMapping(object, field_name, ...)
Returns a matrix with two columns, choice_value and choice_label
May be either a character(1) with the content of the
field choices (i.e. meta_data$select_choices_or_calculations),
or a redcapConnection object.
character(1) gives the field name for which to
make the choice mapping.
arguments to pass to other methods.
Benjamin Nutter, Shawn Garbett