When using uBlas objects with boost::rational types, the program fails to compile throwing this error (MS Visual Studio 2003, SP1) c:\boost_1_34_0_beta\boost_1_34_0\boost\numeric\ublas\traits.hpp(89): error C2665: 'abs' : none of the 5 overloads can convert parameter 1 from type 'const ratio' This code shows the bug: typedef boost::rational<int> ratio; vector<ratio> r(2); r[0] = ratio(2,3); r[1] = ratio(2,7); ratio dNorm = index_norm_inf(r); <-- Error Line Any suggestion to fix it? Thanks, Leopoldo Peralta