Once you know that it's linear, you know that there's some way to describe this function as matrix multiplication.

一旦你知道它的 你就知道有一些方法可以用矩阵法来述这个函数。

You could even define this as matrix vector multiplication when you put the matrix on the left of the vector, like its a function.

你甚至可以把它定义为矩阵向法当你把矩阵放在向的左边 就像它一个函数。

Specifically, since it's a function that goes from three dimensions to one dimension, there will be a one by three matrix that encodes this transformation.

具体来说 因为它一个从三维到一维的函数 会有一个1×3的矩阵来编码这个变换。