I agree that's a poor way to teach matrix multiplication. This topic arose last ... | Hacker News

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		MaxBarraclough 73 days ago \| parent \| context \| favorite \| on: An Illustrated Introduction to Linear Algebra, Cha... I agree that's a poor way to teach matrix multiplication. This topic arose last year. [0] Don't introduce any clumsy nonstandard transformations like 'rotating' a matrix, just highlight the relevant row and column. [1] [0] https://news.ycombinator.com/item?id=41402224 [1] https://www.mathsisfun.com/algebra/images/matrix-multiply-a.... (from https://www.mathsisfun.com/algebra/matrix-multiplying.html )

tptacek 73 days ago [–]

I kind of hate all these, because matrix multiplication is easiest to think of as simply repeated matrix-vector multiplication, which you need anyways (and earlier).

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