In Python NumPy what is a dimension and axis?

Question

I am coding with Pythons NumPy module. If coordinates of a point in 3D space are described as [1, 2, 1], wouldn\'t that be three dimensions, three

Answer 1

It is of rank one, as you need one index to index it. That one axis has the length 3, as the index indexing it can take three different values: v[i], i=0..2.