If I have a $500 \times 500$ matrix and I would like to replace every ($5n-1$) row with the average of $(5n-1)$ and $(5n)$. How would I be able to do this with Mathematica?
2026-03-28 06:40:09.1774680009
averaging two rows in a matrix with mathematica
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Suppose $A$ is the matrix. Then this should work: