How can I compute the percent change of a column in a vaex dataframe when using the shift
function?
import numpy as np
import vaex
df = vaex.from_arrays(x=np.arange(1,4))
df.x / df.shift(periods=1) - 1
results in an error:
File "<unknown>", line 3
1 1
^
SyntaxError: invalid syntax
You need to make a copy of the x column and then shift it.