Error in `linear transformation: scale`

[Tegos]

Hello. Nice job. But there is an error when try to open linear transformation: scale.

Error: Matrix columns length should be equal to vector components length.
    at e.value (vector.js:140)
    at contour.js:20
    at Array.map (<anonymous>)
    at e.value (contour.js:19)
    at renderGridContent (linear-transformation-example.js:20)
    at grid-example.js:19