Hello -- I'm a Numpy Newbie. I have a question for the Numpy gurus about comparisons of multiarray objects and arrays of booleans in particular. Back when I was checking out Numpy for an application, I read a note in the Ascher/Dubois/Hinsen/Hugunin/Oliphant manual about comparisons of multiarray objects. It said and still says: "Currently, comparisons of multiarray objects results in exceptions, since reasonable results (arrays of booleans) are not doable without non-trivial changes to the Python core. These changes are planned for Python 1.6, at which point array object comparisons will be updated." ( http://numpy.sourceforge.net/numdoc/HTML/numdoc.html ) Can anyone comment on what's happening with arrays of booleans in Numpy? I don't want to duplicate someone elses effort, but don't mind standing on someone elses shoulders. My application calls for operations on both non-sparse and sparce matrices. douglas