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

一旦知道它是线性 知道有一些方法可以用乘法来述这个函数。

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

甚至可以把它定义为量乘法当把放在量左边 像它是一个函数。

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 因为它是一个从三维到一维函数 会有一个1×3来编码这个变换。