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Finite sum derivative

  1. Dec 26, 2011 #1
    I have problem like attached.

    Attached Files:

  2. jcsd
  3. Dec 26, 2011 #2


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    Derivative with respect to what?
  4. Dec 27, 2011 #3
    Ok,I need to put this.
    dik=Vi-Xk and represents Eucleadean norm
    Derivative with respect to Vi.
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