Adding a symbolic unit allows it to be used in
set_units. No installation is performed if the
unit is already known by udunits.
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a length 1 character vector that is the unit name or symbol.
warns if the supplied unit symbol is already a valid unit symbol recognized by udunits.
install_symbolic_unit installs a new dimensionless unit; these are directly compatible to any other dimensionless unit. To install a new unit that is a scaled or shifted version of an existing unit, use
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