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Norm of A = [2 3; 1 -1] not equal to sqrt(15)

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Robin Lindström
Robin Lindström 2016-4-29
评论： Robin Lindström 2016-4-29
Let A = [2 3; 1 -1].
norm(A) gives 3.6180 but shouldn't it equal sqrt(15) ~= 3.8730?
Any idea why it is like this?

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Torsten
Torsten 2016-4-29
norm(A)=sqrt(maximum eigenvalue of A'*A)
You want norm(A,'fro'), I guess.
Best wishes
Torsten.

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