Matrices
Where matrices show up in real life
3 live exhibits. Each one already works. Change a number and see what happens.
Open as board Play with these together. Solving one grows related exhibits.
![The edit rotates 90°, mirrors, stretches ×0.7 sideways and ×1 up and down, slants by -0.3. As a matrix that's [0, -1; -0.7, -0.3]. Its determinant is -0.7, so areas are multiplied by 0.7 and the picture is flipped.](/snapshots/MTX-0001/1.svg)
MatricesPhoto edits are matrices: rotate, flip, stretch, and slant
Every rotate, mirror, and stretch in a photo app is four numbers. Multiply each point by them and the picture moves.
MatricesHitting your macros: how much of three foods?
Protein, carbs, and fat are three equations, and three foods are three unknowns. A matrix solves all of them at once.
MatricesHow search ranks pages: links as votes (PageRank)
A link is a vote, and votes from important pages count more. Repeat until it settles and you get PageRank.