Le 10/05/2011 21:18, Samuel GOUGEON a écrit : > Look at that: > > -->atan(0, 0) > ans = > 0.00000000D+00 > > -->atan(0, -0) > ans = > 3.14159265D+00 > > --> -0 == 0 > ans = > T > > :-(( Funny, isn't it ?! This later result is really quite funny, but the atan result is just due to the branch cut definition for that function Serge