# Timelion greatest value so far
**URL:** https://discuss.elastic.co/t/timelion-greatest-value-so-far/172395
**Category:** Kibana
**Tags:** timelion
**Created:** [March 14, 2019, 5:03pm UTC](https://discuss.elastic.co/t/timelion-greatest-value-so-far/172395 "2019-03-14T17:03:06Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Kult](https://discuss.elastic.co/u/Kult)
#### Post date: [March 14, 2019, 5:03pm UTC](https://discuss.elastic.co/t/timelion-greatest-value-so-far/172395/1 "2019-03-14T17:03:06Z")
Hi,
This is likely to be a niche case, but still wondering if there's a solution. Using Timelion, I'd like to find the greatest value _so far_.
Let's assume we have the following time series:
Jan 1: 10
Jan 2: 3
Jan 3: 5
Jan 4: 11
Jan 5: 7
Jan 6: 13
Jan 7: 14
Jan 8: 9
Jan 9: 8
Using whatever greatest value so far algorithm there might be:
On Jan 1, it should give 10;
On Jan 2, it should give 10 as well because 10 \> 3;
On Jan 3, it should give 10 as well because 10 \> 5;
On Jan 4, it should give 11 because 11 \> 10;
On Jan 5, it should give 11 as well because 11 \> 7;
On Jan 6, it should give 13 because 13 \> 11;
On Jan 7, it should give 14 because 14 \> 13;
On Jan 8 and 9, it should give 14 because 14 \> 9 and 14 \> 8.
Best regards.
---
### Author:  [@joshdover](https://discuss.elastic.co/u/joshdover)
#### Post date: [March 14, 2019, 6:59pm UTC](https://discuss.elastic.co/t/timelion-greatest-value-so-far/172395/2 "2019-03-14T18:59:58Z")
Been playing around with this and I haven't found a way to do it with the existing Timelion functions. Basically you need something similar to `cusum` that would calculate the cumulative max.
The good news is, adding new function to Timelion is possible by adding a plugin. Here's a (bit outdated) [example](https://github.com/rashidkpc/timelion-random) and here's the [implementation of cusum](https://github.com/elastic/kibana/blob/master/src/legacy/core_plugins/timelion/server/series_functions/cusum.js#L55) which I imagine would only need subtle changes to become your own `cumax`.
If you get it working, we'd love a pull request upstream! If you're not a developer, [open an issue on the Kibana repo](https://github.com/elastic/kibana) and someone else may pick it up to add to a future Kibana version.
---
### Author:  [@Kult](https://discuss.elastic.co/u/Kult)
#### Post date: [March 21, 2019, 12:48pm UTC](https://discuss.elastic.co/t/timelion-greatest-value-so-far/172395/3 "2019-03-21T12:48:58Z")
Hi Josh,
Thanks for the suggestion. Amending the cusum plugin has worked like a charm.
I've created the pull request here [https://github.com/elastic/kibana/pull/33650](https://github.com/elastic/kibana/pull/33650)
Best regards,
Albert.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 18, 2019, 12:49pm UTC](https://discuss.elastic.co/t/timelion-greatest-value-so-far/172395/4 "2019-04-18T12:49:02Z")
This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.