# Logstash log10 function in ruby

**URL:** <https://discuss.elastic.co/t/logstash-log10-function-in-ruby/251668>\
**Category:** Logstash\
**Created:** [October 11, 2020, 9:44am UTC](https://discuss.elastic.co/t/logstash-log10-function-in-ruby/251668 "2020-10-11T09:44:29Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Ameeruddin\_Mohammed](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ameeruddin_mohammed/32/41289_2.png) [@Ameeruddin\_Mohammed](https://discuss.elastic.co/u/Ameeruddin_Mohammed)\
**Post date:** [October 11, 2020, 9:44am UTC](https://discuss.elastic.co/t/logstash-log10-function-in-ruby/251668/1 "2020-10-11T09:44:29Z")

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hi,  
I have to use log10 function, can anyone support.  
tried both options but didnt work

event.set("AvgRssiHigh", 10\*log10((s.sum/b.sum) / 1000000000000))

event.set("AvgRssiHigh", 10\*((s.sum/b.sum) / 1000000000000).log10)

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<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [October 11, 2020, 2:48pm UTC](https://discuss.elastic.co/t/logstash-log10-function-in-ruby/251668/2 "2020-10-11T14:48:07Z")

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Try

```
event.set("AvgRssiHigh", 10.0*(Math.log10((s.sum/b.sum) / 1000000000000)))
```

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<div class="post-metadata">

**Author:** ![Ameeruddin\_Mohammed](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ameeruddin_mohammed/32/41289_2.png) [@Ameeruddin\_Mohammed](https://discuss.elastic.co/u/Ameeruddin_Mohammed)\
**Post date:** [October 11, 2020, 8:49pm UTC](https://discuss.elastic.co/t/logstash-log10-function-in-ruby/251668/3 "2020-10-11T20:49:27Z")

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> [@Badger](#):
>
> `10.0*(Math.log10((s.sum/b.sum) / 1000000000000))`

thanks. you are truly an expert.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 8, 2020, 8:49pm UTC](https://discuss.elastic.co/t/logstash-log10-function-in-ruby/251668/4 "2020-11-08T20:49:40Z")

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