Ed Schofield <schofield <at> ftw.at> writes: > > > On 08/07/2006, at 10:22 PM, JJ wrote: > > > 3) In some operations, especially range selection operations, a N, > > 1 matrix is > > turned into a 1,N matrix. This is confusing relative to matlab and > > problematic, > > in my view. > > This sounds like a bug. Can you give any examples of this happening > with the latest release or SVN version? > > > <snip> > > > > 5) If X is a 1,n matrix, then X.T should return a n,1 matrix, I > > think. > > This should be the case. Could you post a code snippet that violates > it? > > Thanks for your feedback, JJ! > ----------------------------------------- Hello Ed: Here are a couple of examples off the top of my head:
a = mat(arange(10)) a.shape = (5,2) b = a.copy() c = hstack((a,b)) # should return a matrix type(c) <type 'numpy.ndarray'> a[where(a[:,0]<6)[0],0] #should return a column matrix([[0, 2, 4]]) My version is about a month old, so maybe these are fixed. Since we are on the topic, I dont understand why where() returns a tupple. To me, it just means adding an extra '[0]' in many places in my code. I would vote for where() retuning a matrix (if matrix is the default in the session). My comment on transpose of a 1,n matrix producing a n,1 matrix was in response to a vote question on the list. Also, I would vote for X.A*Y.A to return a matrix, if matrix is the default for a session. Lastly, this might not be the right place for this comment, but it would be nice if pylab allowed numpy matrices. Then code like: plot(d.A.ravel().tolist()) could be changed to plot(d) Hope this is of some help. JJ ------------------------------------------------------------------------- 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 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
