Drexel dragonThe Math ForumDonate to the Math Forum


Math Forum
 Ask Dr. Math
 Discussions
 Internet Newsletter
 MathTools
 Problems of the Week
 Teacher2Teacher
 Teacher Exchange
 Workshops

Search All of the Math Forum:
Browse our Internet Mathematics Library

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: matrix multiplication with zero dimensions
Replies: 11   Last Post: Jan 7, 2013 10:20 AM

Advanced Search
Reply to this Topic Reply to this Topic

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Bruno Luong

Posts: 8,465
Registered: 7/26/08
Re: matrix multiplication with zero dimensions
Posted: Jan 7, 2013 7:15 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Matt J" wrote in message <kcebci$l59$1@newscl01ah.mathworks.com>...
> But I meant also that sum([])=0 and prod([])=1 should be documented somewhere as well. Maybe I just haven't found it yet, though.

For an abelian's group, the sum/product (operator that operates on the group) of an empty set is always the *unity element* of the group.

http://pine.cs.yale.edu/pinewiki/SummationNotation (see "3. products").

Bruno

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2013. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.