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Matrix multiplication

  1. Feb 26, 2010 #1
    if A is [A1|A2|A3|...|An] and C is 1 column matrix given by [C1|C2|C3|...|Cn]T then AC=C1A1+C2A2+...+CnAn.. If D is a diagonal matrix then AD = [D11A1+D22A2+...+DNnAn]. please explain why it happens tht way and whts the prof?
  2. jcsd
  3. Feb 26, 2010 #2

    Gib Z

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    Homework Helper

    The first rule you state is true but only tells you about the product of vectors. Do you know the definition for the product for [itex]A_{(p,r)}[/itex] and [itex]D_{(r,q)}[/itex]? Find the definition in your textbook and give it a try and post us what you did.

    This should be in the homework forum!
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