On Tue, Aug 28, 2012 at 4:17 PM, Peng Yu <pengyu...@gmail.com> wrote:
> Hi,
>
> The closest thing that I can find to initialize a NumericMatrix with a
> NumericVector is the following constructor from Rcpp/vector/Matrix.h.
> But I need to see an example on how to use it. Does anybody have any
> example to share with me? Thanks!
>
> template <typename Iterator>
> Matrix( const int& nrows_, const int& ncols, Iterator start ) :
Just to clarify my original question, I want to convert from native R
vector to matrix directly (not through NumericVector). The following
code involves NumericVector. Does it result in extra copying of a
NumericVector?
> suppressPackageStartupMessages(library(inline))
> fun=cxxfunction(signature(mx='numeric')
+ , body='
+ Rcpp::NumericVector v(mx);
+ Rcpp::NumericMatrix mat(2, 3, v.begin());
+ return mat;
+ '
+ , plugin='Rcpp'
+ )
> orig=1:6
> fun(orig)
[,1] [,2] [,3]
[1,] 1 3 5
[2,] 2 4 6
--
Regards,
Peng
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