1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Proof on matrix multiplication

  1. Sep 12, 2010 #1
    1. The problem statement, all variables and given/known data
    A is an mxn matrix and C is a 1xm matrix. Prove that CA=Sum of (C sub j)*(A sub j) from j=1 to m.
    Where A sub j is the jth row of A

    Sorry for the messy problem statement, I couldn't figure out the summation notation on here.

    2. Relevant equations



    3. The attempt at a solution
    I set (C sub j)*(A sub j)=D sub j
    I then tried to manipulate it towards something, but I made no progress, thanks for any help you can give.
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted