Fix bug introduced a while ago; when quicksorting to build the tree, we have to keep our local matrix up to date (the temporary matrix we passed is modified)
Fix bug introduced a while ago; when quicksorting to build the tree, we have to keep our local matrix up to date (the temporary matrix we passed is modified)


stereomatchingkiss/mlpack,Azizou/mlpack,darcyliu/mlpack,BookChan/mlpack,minhpqn/mlpack,BookChan/mlpack,ranjan1990/mlpack,Azizou/mlpack,ajjl/mlpack,lezorich/mlpack,chenmoshushi/mlpack,minhpqn/mlpack,ersanliqiao/mlpack,trungda/mlpack,bmswgnp/mlpack,thirdwing/mlpack,datachand/mlpack,ajjl/mlpack,lezorich/mlpack,darcyliu/mlpack,theranger/mlpack,datachand/mlpack,trungda/mlpack,ajjl/mlpack,erubboli/mlpack,BookChan/mlpack,minhpqn/mlpack,chenmoshushi/mlpack,ersanliqiao/mlpack,stereomatchingkiss/mlpack,bmswgnp/mlpack,datachand/mlpack,thirdwing/mlpack,ranjan1990/mlpack,trungda/mlpack,theranger/mlpack,Azizou/mlpack,erubboli/mlpack,palashahuja/mlpack,palashahuja/mlpack,palashahuja/mlpack,darcyliu/mlpack,theranger/mlpack,bmswgnp/mlpack,ersanliqiao/mlpack,ranjan1990/mlpack,lezorich/mlpack,chenmoshushi/mlpack,thirdwing/mlpack,erubboli/mlpack,stereomatchingkiss/mlpack