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I have a matrix $A_{w,x,y,z}$ and I want to show average across the w axis.

So I want my new matrix $X$ to be of shape (x,y,z) since we too the mean across w.

What is the proper way to write this in LaTeX notation.

$\sum\limits_{n=1}^{w} A_{n,x,y,z}$

or

$\sum\limits_{n=1}^{w} A_{n}$

amstergc20
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1 Answers1

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The second expression makes no sense.

The first expression is confusing in this context since you seem to be using $w$ both for the name of the first variable and for the dimension on that axis.

The first would be better written with the index $w$ as the dummy variable: $$ \sum_{w=1}^n A_{w,x,y,z} $$ assuming that the first dimension of your matrix $A$ is $n$.

Ethan Bolker
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