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units 0.7-0.Update to version 8.1, the 2018 CODATA recommended values (#7 addressing #6). This version contains some breaking changes that are necessary to streamline future updates and provide a stable symbol table:
codata table includes the absolute uncertainty
instead of the relative one. Thus, the rel_uncertainty
column has been dropped in favour of the new uncertainty.
Also, columns have been slightly reordered.c, the speed of light, has been renamed as c0;
sigma, the Stefan-Boltzmann constant, has been renamed as
sigma0.codata$type)
adopts the names defined by NIST in the webpage too. Some constants
belong to more than one category (separated by comma); some others
belong to no category (missing type).There are some new features too:
codata data frame, this release
includes codata.cor, a correlation matrix for all the
constants.syms_with_errors and
syms_with_units, there is a new list of symbols called
syms_with_quantities (available if the optional
quantities package is installed), which provides constant
values with uncertainty and units.syms_with_errors and syms_with_quantities is
provided (disabled by default; see details in help(syms)
for activation instructions).units::as_units() instead of the deprecated
units::parse_unit() (#1).1 instead of
unitless as unit (#3).Ω has been replaced by ohm (#4).These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.