Matrix Multiplication

This is a cool example of what Bret Victor calls an "Explorable Explanation" [0]. That said, I feel that it's more important to understand how and why matrix multiplication corresponds to a composition of linear transformations than learning the actual mechanics of doing the computation. You can get good at matrix multiplication without knowing what is going on. I view that as a less valuable activity than learning about linear transformations (vector-space structure preserving mappings) between finite dimensional…

The animation looks really neat but I did not find it very helpful from an pedagocical perspective which is why I built an alternative version inspired by OP. [1] /edit: I just noticed the OP is built by andrestaltz with Cycle.js. Cycle is a really nice reactive programming js framework that is very great to work with. [1]: https://static.laszlokorte.de/matrix-multiplication/

Oh hey, that's actually really cool. I never knew how matrix multiplication worked. Honestly, there's a lot of maths I don't necessarily understand as well as I should, but this gives me hope that I will one day be able to get that understanding.

1. Needs a back button. 2. It might be more illustrative if the transposed vectors pass over the matrix one by one. In the default example - you take the [2 6 1] vector and show how its dot products populate the final matrix, then do the same for the [5 7 8] vector. That's closer to the way I think about matrix multiplication.