mlpack::kmeans won't compile and build on windows

[tds151]

The following basic KMeans implementation using RcppMLPACK (v. 1 on CRAN) fails to compile and build with RcppAttributes under Windows R 3.4.1 using the gcc 4.9.3 RTools chain .

// [[Rcpp::depends(RcppMLPACK)]]
// [[Rcpp::plugins(cpp11)]]
#include "RcppMLPACK.h"
using namespace Rcpp;
using namespace arma;
using namespace mlpack::kmeans;

// [[Rcpp::export]]
List cppKmeans(const mat& data, const int& clusters) {
// data is R x N matrix where the columns index multivariate observations
Col<size_t> assignments;
KMeans<> k; // Initialize with the default arguments.
k.Cluster(data, clusters, assignments);
return List::create(Named(”clusters”) = clusters,
Named(”s”) = assignments

);
} /* end function cppKmeans() */

with lots of error messages like this (relating to mp_thread_limit not declared):

C:/R/R-devel/library/RcppArmadillo/include/armadillo_bits/fn_accu.hpp:180:7: error: invalid controlling predicate
for(uword thread_id=0; thread_id < n_threads_use; ++thread_id)
^
C:/R/R-devel/library/RcppArmadillo/include/armadillo_bits/fn_accu.hpp:205:7: error: invalid controlling predicate
for(uword thread_id=0; thread_id < n_threads_use; ++thread_id)
^

[eddelbuettel]

That is older (and stale) code. Maybe try an older (corresponding) RcppArmadillo release with it.