Get information about valid units — valid

These functions require the xml2 package, and return data frames with complete information about pre-defined units from UDUNITS2. Inspect this data frames to determine what inputs are accepted by as_units (and the other functions it powers: as_units, set_units , units<-).

Usage

valid_udunits(quiet = FALSE)

valid_udunits_prefixes(quiet = FALSE)

Arguments

quiet: logical, defaults TRUE to give a message about the location of the udunits database being read.

Value

a data frame with columns symbol , symbol_aliases ,

name_singular , name_singular_aliases , name_plural , or name_plural_aliases , def , definition ,

comment , dimensionless and source_xml

Details

Any entry listed under symbol , symbol_aliases , name_singular , name_singular_aliases , name_plural , or name_plural_aliases is valid. Additionally, any entry under symbol or symbol_aliases may can also contain a valid prefix, as specified by valid_udunits_prefixes() .

Note, this is primarily intended for interactive use, the exact format of the returned data frames may change in the future.

Examples

if (requireNamespace("xml2", quietly = TRUE)) {
  valid_udunits()
  valid_udunits_prefixes()
  if(interactive())
    View(valid_udunits())
}
#> udunits database from /usr/share/xml/udunits/udunits2.xml
#> udunits database from /usr/share/xml/udunits/udunits2.xml