Question

I’m doing some return calculations and I’d like to do the below as elegantly as possible, but my knowledge of list comprehension is not good enough. (The list x can be any length, not just 4 elements, the elements are floating point numbers).

x = [a, b, c, d]
y = [(a-b)/b, (b-c)/c, (c-d)/d]

Thanks!

Answer 1

This seems plausible, doesn’t it?

>>> x = [1.,2.,3.,4.]
>>> [ ((e-f)/f) for e,f in zip ( x[:-1], x[1:]) ]
[-0.5, -0.3333333333333333, -0.25]