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Frobenius norm perhaps?

Most likely one of the matrix norms.

- Pauli

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That's because it returns the Frobenius (Euclidean) norm of the matrix array, which is the square root of the sum of the squares of the matrix elements. So for a 2x2 identity matrix it's sqrt (1^2+1^2) = sqrt (2). In the special case of a 2D or 3D vector, the absolute value is interpreted as the magnitude or length of the vector.

*Edited: 5 Nov 2013, 12:12 a.m. *