Robert Kern wrote: > On Sun, Jun 7, 2009 at 04:44, Olivier Verdier <zelb...@gmail.com> wrote: >> Yes, I found the thread you are referring >> to: http://mail.python.org/pipermail/python-dev/2008-July/081554.html >> However, since A*B*C exists for matrices and actually computes (A*B)*C, why >> not do the same with dot? I.e. why not decide that dot(A,B,C) does what >> would A*B*C do, i.e., dot(dot(A,B),C)? >> The performance and precision problems are the responsability of the user, >> just as with the formula A*B*C. > > I'm happy to make the user responsible for performance and precision > problems if he has the tools to handle them. The operator gives the > user the easy ability to decide the precedence with parentheses. The > function does not. >
The function could, with suitable parsing of the argument(s): (A*B)*C => dot( ((A,B),C) ) or dot( (A,B), C ) A*(B*C) => dot( (A, (B,C)) ) or dot( A, (B,C) ) Effectively, the comma is becoming the operator. Eric _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
