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

一旦你它是线性的 你有一些方法可以用阵乘法来述这个函数。

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

你甚至可以把它定阵向量乘法当你把阵放在向量的左边 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 因它是一个从三维到一维的函数 会有一个1×3的阵来编码这个变换。