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).