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: Row-specific scalar multiplication
Replies: 5   Last Post: Mar 15, 2011 12:53 PM

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 ]
Abed Alnaif

Posts: 13
Registered: 10/21/08
Row-specific scalar multiplication
Posted: Mar 12, 2011 4:12 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Hi,
I'm trying to do row-specific matrix multiplication. I know that this is confusing; it is best described by an example:

For example, say that I have:

f = [2; 4];

A = [1 2 3; 1 2 3];

I'm trying to find an operation such that

f .* A

returns

[2 4 6; 4 8 12]

In this example, I used the ".*" operation. However, this returns a Matlab error since the matrix dimensions do not agree. Does anyone know of a way to accomplish what I am trying to do, without resorting to loops?

Thanks,

Abed Alnaif

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

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2015. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.