Hi, While using the most recent version of Boost (boost_1_34_1) I noticed some problems when resizing a symmetric matrix. I included a test program to illustrate the problems. (Recent SVN snapshots and boost 1.33 have the same problem) When executing I get the following error caused by resizing the symmetric matrix with the preserve option set to true: Resize ml to bigger size Check failed in file /home/fiep/sources/boost_1_34_1/boost/numeric/ublas/storage.hpp at line 196: i < size_ terminate called after throwing an instance of 'boost::numeric::ublas::bad_index' what(): bad index Aborted (core dumped) Note that are no problems when resizing normal matrices nor resizing symmetric matrices when the preserve option is set to false. When stepping into the program, it seems that something goes wrong with the indexing of the symmetric matrix. I suspect that problems are caused by the use of the matrix_resize_preserver routine which is called in case the preserve option is set to true. I think this routine is designed for normal matrices only and expects a matrix which is completely filled as opposed to a symmetric matrix in which only one triangle is filled. Do I use the library in a wrong way or might this be a BUG? Kind regards, Tinne De Laet _______________________________________ Tinne De Laet Department of Mechanical Engineering - PMA Katholieke Universiteit Leuven Celestijnenlaan 300B - bus 2420 3001 Heverlee Tel: +32 (0)16 32 25 33 http://people.mech.kuleuven.be/~tdelaet/ _______________________________________ Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm