It seems to me that it’s affine transformation, not linear, insofar as we consider the drawn intersection point of the axes to be the zero point of display-space. (It would be linear if the data were on the left of the axis.)
(Context: I am currently taking a course on linear algebra, so this came readily to mind, but I may lack further relevant information.)
Also, looking at the slides, the x axis is increasing rightward in its (unfortunately black-on-dark-blue) labels. So it’s not so much the graph as the scale being used that is flipped. Perhaps they simply plotted the data using default sort-numerically-increasing software settings and didn’t think about it too hard since they’re used to working with that scale.
Brilliant title.
It seems to me that it’s affine transformation, not linear, insofar as we consider the drawn intersection point of the axes to be the zero point of display-space. (It would be linear if the data were on the left of the axis.)
(Context: I am currently taking a course on linear algebra, so this came readily to mind, but I may lack further relevant information.)
Also, looking at the slides, the x axis is increasing rightward in its (unfortunately black-on-dark-blue) labels. So it’s not so much the graph as the scale being used that is flipped. Perhaps they simply plotted the data using default sort-numerically-increasing software settings and didn’t think about it too hard since they’re used to working with that scale.
Hah! You’re right.