How could it be negative zero cost?

怎么可能是负零成本呢？

Likewise to follow j hat. The 2nd column of M tells us that it 1st lands on negative two zero.

同理 j帽 M的第二列告诉我们它首先落在-20上。

E.g. if we rotate all of space 90 degrees counter clockwise, then I Hat lands on the coordinates zero one, and Jay hat lands on the coordinates negative one zero.

例如 如果我们将整个空间逆时针旋转90度 那么IHat落在坐标01上 JayHat落在坐标-10上。

So let's make that the 1st column of a matrix, likewise j Hat, ultimately ends up at the location negative one zero, so we make that the 2nd column of the matrix.

我们让它成为矩阵的第一列 同样j帽 最终在-1 0的位置 所以我们让它成为矩阵的第二列。