As someone who is very used to thinking in terms of matrices and who just went through the adjustment of translating matlab-like code to numpy, I found the current matrix module to be confusing.  It&#39;s poor integration with the rest of numpy/scipy (in particular, scipy.optimize.fmin_cg) made it more difficult to use than it was worth.  I&#39;d rather have &quot;matrix&quot; and/or &quot;matrix multiplication&quot; sections of the documentation explain how to do typical, basic matrix operations with nparray, dot, T, and arr[None,:].  I think a matrix class would still be worthwhile for findability, but it should simply serve as documentation for how to do matrix stuff with nparray.<br>
<br>Cheers,<br><br>Jason<br clear="all"><br>-- <br>Jason Rennie<br>Research Scientist, ITA Software<br>617-714-2645<br><a href="http://www.itasoftware.com/">http://www.itasoftware.com/</a><br><br>