In data science, it is a common practice to compute a series of columns (e.g. features) against a common response vector. Various metrics are provided with efficient computation implemented with 'Rcpp'.

Provides 'C++' header files to deal with color conversion
    from some color spaces to hexadecimal with 'Rcpp', and exports some
    color mapping functions for usage in R. Also exports functions to
    convert colors from the 'HSLuv' color space for usage in R. 'HSLuv' is
    a human-friendly alternative to HSL.

'Rcpp' Bindings for the C code of the 'Corpus Workbench' ('CWB'), an indexing and query 
  engine to efficiently analyze large corpora (<https://cwb.sourceforge.io>). 'RcppCWB' is licensed
  under the GNU GPL-3, in line with the GPL-3 license of the 'CWB' (<https://www.r-project.org/Licenses/GPL-3>).
  The 'CWB' relies on 'pcre2' (BSD license, see <https://github.com/PCRE2Project/pcre2/blob/master/LICENCE.md>)
  and 'GLib' (LGPL license, see <https://www.gnu.org/licenses/lgpl-3.0.en.html>).
  See the file LICENSE.note for further information. The package includes modified code of the
  'rcqp' package (GPL-2, see <https://cran.r-project.org/package=rcqp>). The original work of the authors
  of the 'rcqp' package is acknowledged with great respect, and they are listed as authors of this
  package. To achieve cross-platform portability (including Windows), using 'Rcpp' for wrapper code
  is the approach used by 'RcppCWB'.

A header-only C++ library is provided with support
 for dates, time zones, ISO weeks, Julian dates, and Islamic dates.
 'date' offers extensive date and time functionality for the C++11,
 C++14 and C++17 standards and was written by Howard Hinnant and released 
 under the MIT license. A slightly modified version has been accepted
 (along with 'tz.h') as part of C++20. This package regroups all
 header files from the upstream repository by Howard Hinnant so that
 other R packages can use them in their C++ code. At present, few of
 the types have explicit 'Rcpp' wrappers though these may be added as
 needed.