On 11 August 2015 at 12:30, Florian Plaza Oñate wrote:
| Hi everyone,
|
| I am trying to copy the rownames and the colnames from a NumericMatrix
| to another NumericMatrix by using Rcpp
|
| Here is my code:
|
| Rcpp::NumericMatrix copy(const Rcpp::NumericMatrix& m)
| {
| Rcpp::NumericMatrix m2(num_genes, num_samples);
| Rcpp::rownames(m2) = Rcpp::rownames(m);
| Rcpp::colnames(m2) = Rcpp::colnames(m);
If you want a full copy, try
Rcpp::NumericMatrix m2 = Rcpp::clone(m);
as in
R> cppFunction("NumericMatrix foo(NumericMatrix m) { return Rcpp::clone(m); }");
R> m <- matrix(1:4,2,2,TRUE,list(c("a","b"), c("c", "d")))
R> foo(m)
c d
a 1 2
b 3 4
R>
| return m2;
| }
|
| It does change the default rownames and colnames of the NumericMatrix.
| Do you know how to do it?
Now I am confused. You do want to change them or not?
If you do _not_ use clone(), then m2 and m share the same underlying
pointer. This has been explained before: we use proxy objects which are more
lightweight. Distinct copies require clone().
Dirk
--
http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
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