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[Rcpp-devel] Create scalar values in Rcpp

Dirk Eddelbuettel
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

Thread (7 messages)

Wolf Vollprecht Create scalar values in Rcpp Dec 10 Avraham Adler Create scalar values in Rcpp Dec 10 Dirk Eddelbuettel Create scalar values in Rcpp Dec 10 Jeff Newmiller Create scalar values in Rcpp Dec 10 Dirk Eddelbuettel Create scalar values in Rcpp Dec 10 Jeff Newmiller Create scalar values in Rcpp Dec 10 Wolf Vollprecht Create scalar values in Rcpp Dec 11