Using optimization.h in Rcpp

[Vivianstats]

Thank you very much for this package! I want to do constrained optimization with Rcpp and found this package helpful.

I would like to test the examples given in optimization_ex.cpp.html (http://dlib.net/optimization_ex.cpp.html) in Rcpp but got the following message:

no matching constructor for initialization of 'dlib::matrix<double,0,1, dlib::memory_manager_stateless_kernel_1,dlib::row_major_layout>'

Below are my codes:

include

using namespace Rcpp; // [[Rcpp::plugins(cpp11)]] // [[Rcpp::depends(dlib)]]

include <dlib/optimization.h>

using namespace dlib; using namespace std; typedef matrix<double,0,1> column_vector; // [[Rcpp::export]] double rosen (const column_vector& m) { //const column_vector m; //const double x = m(0); //const double y = m(1); const double x = 1; const double y = 1; double res = 100.0pow(y - xx,2) + pow(1 - x,2); return(res); }

Can you provide me with some guidance on the problem? Thanks.

[jwijffels]

Vivian, I only used this package for image recognition, not on optimisation. If you have questions on the C++ part, I believe you should better redirect your question to the dlib mailing list.

[Vivianstats]

Thanks for the information. Since I'm just using the examples codes given in the dlib library, I think the problem might be in the interface between R and Rcpp, but I didn't figure out the solution yet.

[jwijffels]

Blindly copy-pasting the examples also did not work out for me when I implemented image.dlib on top of dlib https://github.com/bnosac/image/tree/master/image.dlib. Your error indicates that there is no matching constructor. That looks like you did not load the right header files but again I'm not an expert in the optimisation header.

[jwijffels]

Closing as no active feedback given in last month.