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Homework Help: MATLAB help, code for Frobenius norm

  1. Feb 23, 2013 #1

    I am trying to write a mtlab code to compute Frobenius norm of an mxn matrix A.

    defined by
    [tex] ||A||_{F} = \sqrt{ \sum_{i=1}^m \sum_{j=1}^n a^{2}_{i,j}} [/tex]

    I have so far written this code, but it does not work, if anyone can help /guide me to the right path, would be greatly appreciated.

    function w = frobeniusnorm(a,m,n)
    for i =1:m
    sm = 0
    for j =1:n
    sm = sm+A(i,j)*a^2(i,j);
  2. jcsd
  3. Feb 27, 2013 #2


    User Avatar
    Science Advisor
    Gold Member

    You need to initialize the sum before you start your loops, so put the 3rd line before the 2nd. Don't forget to take the square root at the end.
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