Hello everybody out there ! I am Yoann LE BARS. I am french, so please excuse my hesitating english. I have post on http://boost-sandbox.sourceforge.net/vault/ the file inverse.tar.gz, which contains a method to inverse matrix using uBlas. When I ask on Boost user's list if someone if interessted on some code I have made which solve general linear systems (square non singular, singular square, unsquare), Jonathan Turkanis invit me to send a description of it into the developers list, so I come here (I hope that it is the good list). So, I have implement some code which solve general linear systems, using restarted GMRES and least square method. Of course, it use Boost (uBlas) and the data waiting are matrix_expression and vector_expression. I can upload this code on the Boost Sandbox, if anyone is interessted on. Best regards. Yoann LE BARS