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How do I express the matlab function abs(M), on a matrix M, in mathematical terms?

I thought about norms or just |M|, but these return scalars, not another matrix of the same size as M.

Sorry for the rough explanation, english isn't my primary language.

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    One speaks of taking the absolute value "componentwise" or "elementwise". I don't know of any other name or notation for this operation.2011-03-11

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