In the post on lesson 163, we talked about matrices for reflection. In this post, we’re going to talk about matrices for rotation. The matrix for rotating something 90° can be written as the following two expressions: [-1 0] ×…

Scale changes is when you change the size of something either vertically or horizontally. On a coordinate system, this would look like this: (x,y)–> (ax, by). If the absolute value of either a or b is greater than 1, then…

Unlike adding or subtracting matrices, you don’t have to have the same dimensions when multiplying matrices. The one thing that you do have to have in common is that the first matrix has to have the same amount of columns…

You can’t add matrices that have different dimensions. For example: [ 2  -3 ] can’t be added to [ 1 ]. Adding matrices is easy though, if you do have the correct [ 7   5 ]                                 [ 0 ] dimensions.…