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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);

end