I'm not sure if it's a bug but: when using variance (from mapping library) - I get negative numbers. Since variance is supposed to be always positive and I don't see anything wrong in the way the abstraction is done, I presume there is something I'm missing. My impression is that small changes in the input translate to negative 'variance'
Oded Ben-Tal http://ccrma.stanford.edu/~oded oded@ccrma.stanford.edu