On Apr 5, 2009, at 12:18 AM, David Cournapeau wrote: > On Sun, Apr 5, 2009 at 11:17 AM, Pierre GM <pgmdevl...@gmail.com> > wrote: >> All, >> I'm trying to build a relatively complicated symmetric matrix. I can >> build the upper-right block without pb. What is the fastest way to >> get >> the LL corner from the UR one ? >> Thanks a lot in advance for any idea. > > I may be missing something, but why not building it from scratch + a > couple of elementary operations ? Is it too slow ? For example: > > # Assuming the lower part of a is zero before the operation > a + a.T - np.diag(a.diagonal())
Sweet! Works pretty well indeed. I didn't think about that (that was a bit late on a Sat. night for numpy). Thx again. _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
