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: Temporary output when assigning into slices?
Replies: 10   Last Post: Jan 27, 2013 3:53 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 ]
Matt J

Posts: 4,988
Registered: 11/28/09
Re: Temporary output when assigning into slices?
Posted: Jan 24, 2013 12:09 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Matt J" wrote in message <kdrm3k$ecb$1@newscl01ah.mathworks.com>...
>
> Then that's pretty fancy and new. I definitely see a difference in R2012a:
>
>
> N=1e7;
> M=1;
> B=rand(M,N);
> C=rand(N,10);
>
>
> tic;
> B*C(:,1);
> toc;
> %Elapsed time is 0.043724 seconds.
>
> z=C(:,1);
> tic
> B*z;
> toc
> %Elapsed time is 0.011419 seconds.
=====================

In fact, I just tested it with R2012b and I see the same relative performance. So, I still think SUBSREF ops always allocate memory.

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.