Frobenius norm of the error matrix

Hi, How how can I implement this expression?

[kortas manel]

D is a matrix

Answer 1

[Matt J]

norm(D-Dhat,'fro').^2/(M*N)

[kortas manel]

Thank you Matt, I did the same, I wanted to know if there is another suggestion.

[Matt J]

What shortcomings in norm(..,'fro') are you hoping the alternative suggestions will remedy?

[kortas manel]

I was afraid that taking a predefined matlab function can make errors, thank you for confirming my implementation