I've two series.
I want to multiply them together (easy), but I want to make the answer negative depending on the sign of the value in one of the series.
ie x = a * b * sgn (b)
What's the technique for doing this?
N
Maybe something along these lines would get you closer...
> python
Python 2.7.10 (default, Nov 7 2015, 11:34:05)
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas as pd
>>> import numpy as np
>>> li1=[-2,+3,-4,+5]
>>> li2=[+3,+4,-5,-6]
>>> se1=pd.Series(li1)
>>> se2=pd.Series(li2)
>>> se3=np.abs(se1)*np.abs(se2)*np.copysign(1,se1)
>>> se3
0 -6
1 12
2 -20
3 30
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