Message-ID: <23566.38257.155475.64454@rob.eddelbuettel.com>
Date: 2018-12-10T16:33:53Z
From: Dirk Eddelbuettel
Subject: [Rcpp-devel] Create scalar values in Rcpp
In-Reply-To: <CAL6gwn+pFvBb0GWdp_v04WcaP-dwUZf-dEx_oTrvXbYMRH1EEQ@mail.gmail.com>
On 10 December 2018 at 11:24, Avraham Adler wrote:
| There are no scalars in R; there are vectors of length 1.
Yep. An R feature, and gotcha if you come from somwhere else. See
R> a <- 1
R> is.vector(a)
[1] TRUE
R>
And while we can do this
R> Rcpp::cppFunction("double wolf(double x) { return x+x; }")
R> wolf(21.0)
[1] 42
R>
it involves a combination of casts and our template magic so make it SEXPs
which, as representations of R types, are always vectors.
Dirk
--
http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org