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I have matrix $\textbf{X}$. And I need to denote the vector of mean values of the matrix columns.

Is it correct to use $\bar{\textbf{x}}$? Or Should I use different notation? Or is this notation correct if I use explanation what it means?

What is the most correct approach?

matousc
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1 Answers1

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I think it is correct if you introduce that notation. Also note that to be really correct, you should always write something like “let $X, Y$ be some matrices and let $\bar{x}, \bar{y}$ denote the corresponding vectors of means of the columns” any time you consider particual matrices.

On the other hand, if you use notation $\bar{X}$ instead, you may write “$\bar{X}$ denotes the vector of mean values of the columns of any matrix $X$”, and then you can use $\bar{X}, \bar{Y}, \bar{Z}$ without any further explanation.

user87690
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