It seems that identity_matrix does not work with row(); is this supposed to be the case? For example: ----------- code excerpt ----------- #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/vector.hpp> int main () { using namespace boost::numeric::ublas; //matrix<double> im(3,3); // this works identity_matrix<double> im(3); // this does not boost::numeric::ublas::vector<double> v = row(im,1); } ------------------------------------ Using matrix<> im, the code works fine, but using identity_matrix<> im, g++ blows up with four or five errors of the form included below, on lines 529, 61, 100, 104, and 84 of matrix_proxy.hpp. I've got quite a lot of questions on ublas, even after combing through the ublas and boost documentation, wiki, and mailing lists at great length. Is this an appropriate forum to pepper with questions, or is there some other manual I can RTFM first? Thanks, -Alex -------- errors excerpt compiling the above --------- /home/linux/phcomp/ph141w/ph141wam/libraries/boost_1_30_0/boost/numeric/ublas/matrix_proxy.hpp: In instantiation of `boost::numeric::ublas::matrix_row<boost::numeric::ublas::identity_matrix<double>

': rowtest.cpp:10: instantiated from here /home/linux/phcomp/ph141w/ph141wam/libraries/boost_1_30_0/boost/numeric/ublas/matrix_proxy.hpp:529: no type named `closure_type' in `class boost::numeric::ublas::identity_matrix<double>' /home/linux/phcomp/ph141w/ph141wam/libraries/boost_1_30_0/boost/numeric/ublas/matrix_proxy.hpp:529: template argument 3 is invalid