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Second norm of matrix

  1. Aug 26, 2004 #1
    Hi,
    I have forgotten the formula for calculating the second norm of matrix. Does anyone know the formula?
    Regards,
    Niko
     
  2. jcsd
  3. Aug 26, 2004 #2

    Hurkyl

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    Are you talking about the norm usually written as [itex]||A||_2[/itex]? You simply consider the (mxn) matrix as an mn-tuple: the square of the norm is the sum of the squares of the entries.
     
  4. Sep 17, 2004 #3

    mathwonk

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    this is also called the pythagorean theorem. i'll bet you haven't really forgotten it. almost no one ever does: a^2 + b^2 = c^2.
     
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