Very good, static_cast should then do it! Best
Simon On Feb 3, 2013, at 6:26 PM, Yan Zhou <zhou...@me.com> wrote: > Yes, of course. > > I was thinking about the situation where NLOpt pass the parameter and > (possible) gradient vector through pointers and you need to use Armadillo on > these vectors. But if all you need is to pass a matrix as the function data, > in principle you can pass almost anything through void *. > > Best, > > Yan Zhou > > On Feb 03, 2013, at 05:13 PM, Simon Zehnder <szehn...@uni-bonn.de> wrote: > >> Mmmmmh, I just think about the function data: It is pointed to via void*. >> That should give me the possibility to directly point to a arma::mat, right? >> That would be the easiest way to do it. >> >> Best >> >> Simon >> On Feb 3, 2013, at 5:45 PM, Yan Zhou <zhou...@me.com> wrote: >> >> > I believe the answer is no. But most Arma object provide memptr to get the >> > raw pointer which you can pass through nlopt interface. Inside the >> > objective function you can create Arma object using auxiliary pointer. >> > AFAIK, for const double * argument you can only creat Arma object by copy >> > while for double * you can creat object that use the pointer directly. >> > After this step you can use armadillo inside and outside the objective >> > function. >> > >> > Best, >> > >> > Yan >> > >> > On Feb 3, 2013, at 4:35 PM, Simon Zehnder <szehn...@uni-bonn.de> wrote: >> > >> >> Hi Yan, >> >> >> >> do you know if one can also write a C++ objective function in NLOpt, that >> >> works with Armadillo Objects? >> >> >> >> Best >> >> >> >> Simon >> >> >> >> On Feb 3, 2013, at 12:50 PM, Yan Zhou <zhou...@me.com> wrote: >> >> >> >>> I good numerical optimization library I used before is NLOpt, for >> >>> non-linear optimization. http://ab-initio.mit.edu/wiki/index.php/NLopt >> >>> >> >>> You can use it just like and C/C++ library in your own code or you can >> >>> use its own R interface as an R package. >> >>> >> >>> Best, >> >>> >> >>> Yan >> >>> >> >>> On Feb 3, 2013, at 11:47 AM, Simon Zehnder <szehn...@uni-bonn.de> wrote: >> >>> >> >>>> Hi fellows, >> >>>> >> >>>> I am using the RcppArmadillo package and I need in C++ some >> >>>> optimization methods. Before I used always the Scythe Statistical >> >>>> Library which had both: linear algebra and optimization methods. >> >>>> Armadillo has only linear algebra support. >> >>>> >> >>>> Now my question: What numerical optimization libraries in C++ do you >> >>>> use, when working with RcppArmadillo? It should be fast! >> >>>> >> >>>> >> >>>> Best >> >>>> >> >>>> Simon >> >>>> >> >>>> >> >>>> _______________________________________________ >> >>>> Rcpp-devel mailing list >> >>>> Rcpp-devel@lists.r-forge.r-project.org >> >>>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel >> >>> >> >> >>
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