Folks, You can find a new patch for MA on the wiki http://projects.scipy.org/scipy/numpy/attachment/wiki/MaskedArray/ma-2006032... along with a test suite. The 'clip' method should now work with array arguments. Were also added cumsum, cumprod, std, var and squeeze. I'll deal with flags, setflags, setfield, dump and others when I'll have a better idea of how it works -- which probably won't happen anytime soon, as I don't really have time to dig in the code for these functions. AAMOF, I'm more interested in checking/patching some other aspects of numpy for MA (eg, mlab...) Once again, please send me your comments and suggestions. Thx for everything P.