Hi, [You may want to edit the numpy homepage numpy.scipy.org to tell people they must subscribe to post, and adding a link to http://www.scipy.org/Mailing_Lists] Many of you probably know of the interpreter yorick by Dave Munro. As a Livermoron, I use it all the time. There are some built-in functions there, analogous to but above and beyond numpy's sum() and diff(), which are quite useful for common operations on gridded data. Of course one can write their own, but maybe they should be cleanly canonized? For instance: x = linspace(0,10,10) y = sin(x) It is common, say when integrating y(x), to take "point-centered" data and want to zone-center it: I = sum(zcen(y)*diff(x)) def zcen(x): return 0.5*(x[0:-1]+x[1:]) Besides zcen, yorick has builtins for "point centering", "un-zone centering," etc. Also, due to its slick syntax you can give these things as array "indexes": x(zcen), y(dif), z(:,sum,:) Just some thoughts, David Strozzi