what is the mathematical notation equivalent to abs(A) for matrix A?

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Michael
Michael 2013-3-7
I'm trying to write notes for my code and I want to know if there's a common notation which means what abs(A) does, ie. multiply every negative element by -1 and leave non-negative elements unchanged? (it's all real).
I don't think I've ever seen this before. Thanks for any help.
edit- this is using word 2010 so I have all the equation tools

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回答（2 个）

Babak
Babak 2013-3-7
编辑：Babak 2013-3-7
in office you can type |A| as to represent abs(A)
Wayne King
Wayne King 2013-3-9
编辑：Wayne King 2013-3-9

I agree with Michael that |A| is not the correct notation because this is most often used for the determinant. I do not believe there is an accepted notation for this.

I think the best you can do is to describe it. Perhaps you can refer to the elements of the matrix. "Form the matrix $Y$ from the elements of $X$, such that $Y_{ij} = X_{ij}$

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