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A matrix (plural matrices) is a rectangular array of numbers, symbols, or expressions arranged in rows and columns. The individual items in a matrix are called its elements or entries.

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similarity measure [closed]

I have some question concern similarity measure and i need your help (I'am new in statistics) Suppose that we have a matrix $M$ where $M(i, j)$ is the similarity measure between user $i$ and user $j$ … What is the maximum size of the matrix? What are its properties? How would you choose the store? Thank you very much for your help bests …
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