Matrix completion

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Hello. Is nuclear norm usuable in cvx?

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help norm_nuc

norm_nuc Nuclear norm of a matrix.
norm_nuc(X) = SUM(SVD(X)). X must be a 2-D matrix, real or complex.

Disciplined convex programming information:
    norm_nuc(X) is convex and nonmontonic in X, so X must be affine.
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