# How do I multiply points in a series?

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?

## Question information

- Language:
- English Edit question

- Status:
- Solved

- For:
- Graphite Edit question

- Assignee:
- No assignee Edit question

- Solved by:
- Marcus Holmgren

- Solved:
- 2017-09-12

- Last query:
- 2017-09-12

- Last reply:
- 2017-09-11

Denis Zhdanov (deniszhdanov) said : | #1 |

You need to multiply values to some constant? Just use scale() function - https:/

Marcus Holmgren (muzzle75) said : | #2 |

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

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.

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.

Denis Zhdanov (deniszhdanov) said : | #5 |

Yes, that should work, indeed!