Hello, I am using the CVS Head version of uBLAS from approximately one month ago with gcc. I get a ton of errors when trying to multiply a dense vector by a compact matrix. This is what my code looks like: la::compressed_matrix<int>* permutationMatrix; template<class T> void Permutation::apply(la::vector<T>& dataPoint){ dataPoint = prod(*permutationMatrix,dataPoint); } What, conceptually, am I doing wrong? If asked, I will happily provide more information. For now, I am trying to keep this email to a reasonable size. Thank you, -- dan ************************** Dan Elliott 402-210-6429 (me) or 402-210-6735 (amy) dan_elliott@cox.net **************************