gnu: Add r-rcppalgos.

* gnu/packages/cran.scm (r-rcppalgos): New variable.

gnu/packages/cran.scm

@@ -13484,6 +13484,38 @@ regressions).  NOTE: Weighted partial correlation calculations pulled to
 address a bug.")
   (license license:gpl2+)))
 
+(define-public r-rcppalgos
+  (package
+    (name "r-rcppalgos")
+    (version "2.5.3")
+    (source (origin
+              (method url-fetch)
+              (uri (cran-uri "RcppAlgos" version))
+              (sha256
+               (base32
+                "1ndibdf3k02bpcgackzviczramzkay9idn071nix3dhs5miq1ai8"))))
+    (properties `((upstream-name . "RcppAlgos")))
+    (build-system r-build-system)
+    (inputs (list gmp))
+    (propagated-inputs (list r-cpp11 r-gmp))
+    (native-inputs (list r-knitr))
+    (home-page "https://github.com/jwood000/RcppAlgos")
+    (synopsis
+     "High performance tools for combinatorics and computational mathematics")
+    (description
+     "This package provides optimized functions and flexible combinatorial
+iterators implemented in C++ for solving problems in combinatorics and
+computational mathematics.  It utilizes the @code{RMatrix} class from
+@code{RcppParallel} for thread safety.  There are combination/permutation
+functions with constraint parameters that allow for generation of all results
+of a vector meeting specific criteria.  It is capable of generating specific
+combinations/permutations which sets up nicely for parallelization as well as
+random sampling.  Gmp support permits exploration where the total number of
+results is large.  Additionally, there are several high performance number
+theoretic functions that are useful for problems common in computational
+mathematics.")
+    (license license:gpl2+)))
+
 (define-public r-rcppannoy
   (package
     (name "r-rcppannoy")