Figure 1.7 vector length labels are wrong in the last picture

[tjunnone]

In Figure 1.7, Vector Subtraction, the last (4th) vector image has the vector length labels swapped. 2 should be horizontal vector length, and -2 should be the vertical vector length.

[tjunnone]

I think the picture would also be clearer if -v was labeled in the last step.

[shiffman]

Moved to here: https://github.com/shiffman/The-Nature-of-Code/issues/97 Thank you!!