In the manual, I found the following for the command “norm”:

⋆ norm: norms for real and complex vectors and matrices. Convex. The oneargument

version norm(x) computes the 2-norm for vectors and induced 2-norm

(maximum singular value) for matrices. The two-argument version norm(x,p)

is supported as follows:

– For vectors, all p ≥ 1 are accepted, but see Appendix D.2 for more details

about how cvx handles values other than 1, 2, and Inf.

– For matrices, p must be 1, 2, Inf, or ’Fro’.

So my question is - what does 'Fro" mean?

Many thanks!

Frank