Integration of the 'units' and 'errors' packages for a complete
quantity calculus system for R vectors, matrices and arrays, with automatic
propagation, conversion, derivation and simplification of magnitudes and
uncertainties. Documentation about 'units' and 'errors' is provided in the
papers by Pebesma, Mailund & Hiebert (2016, ) and
by Ucar, Pebesma & Azcorra (2018, ), included in
those packages as vignettes; see 'citation("quantities")' for details.

The quantities package provides integration of the 'units' and 'errors' packages for a complete quantity calculus system for R vectors, matrices and arrays, with automatic propagation, conversion, derivation and simplification of magnitudes and uncertainties.