Living in a World Built on the Following Axioms...

u + (v + w) = (u + v) + w

u + v = v + u

v + 0 = v

v + (- v) = 0

a (b v) = (a b) v

1 v = v

a (u + v) = a u + a v

(a + b) v = a v + b v

container emulation

The Python data model makes it easy to implement classes that allow concise data access. For example, when analyzing skin marker motion capture data, I frequently access data for a particular marker (identified by its name). Below I demonstrate how to access marker data from a trial (say arm raising and lowering) using an instance method, and via container emulation.