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How do I multiply points in a series?

Asked by Marcus Holmgren on 2017-09-11

I have a data serie that is the quota of current balance of an account, divided be the last known value. For example: 1.01, 0.99, 1.01, 1.00, 1.00, 1,02 etc

I want to multiply all points in the serie to get a compounded graph, but I just cant figure out how to do that?

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Denis Zhdanov (deniszhdanov) said : 		#1

You need to multiply values to some constant? Just use scale() function - https://graphite.readthedocs.io/en/latest/functions.html#graphite.render.functions.scale

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Marcus Holmgren (muzzle75) said : 		#2

No, I need to multiply all points in the serie with each other

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Denis Zhdanov (deniszhdanov) said : 		#3

Ah, OK. Unfortunately, it's quite a rare operation in time series analysis, so, IIRC no such function exist in Graphite.

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Marcus Holmgren (muzzle75) said : 		#4

Thank you for your help! Actually I just managed to modify the Integral function in functions.py to multiply instead of summarize, so I think it should work now.

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Denis Zhdanov (deniszhdanov) said : 		#5

Yes, that should work, indeed!