Folks, I just posted on the scipy/developers zone wiki (http://projects.scipy.org/scipy/numpy/wiki/MaskedArray) a reimplementation of the masked_array mopdule, motivated by some problems I ran into while subclassing MaskedArray. The main differences with the initial numpy.core.ma package are that MaskedArray is now a subclass of ndarray and that the _data section can now be any subclass of ndarray (well, it should work in most cases, some tweaking might required here and there). Apart from a couple of issues listed below, the behavior of the new MaskedArray class reproduces the old one. It is quite likely to be significantly slower, though: I was more interested in a clear organization than in performance, so I tended to use wrappers liberally. I'm sure we can improve that rather easily. The new module, along with a test suite and some utilities, are available here: http://projects.scipy.org/scipy/numpy/attachment/wiki/MaskedArray/maskedarra... http://projects.scipy.org/scipy/numpy/attachment/wiki/MaskedArray/masked_tes... http://projects.scipy.org/scipy/numpy/attachment/wiki/MaskedArray/test_maske... Please note that it's still a work in progress (even if it seems to work quite OK when I use it). Suggestions, comments, improvements and general feedback are more than welcome ! ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642