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website: Beginnings of "Functions" configuration section Previously we just listed out all of the functions in alphabetical order inside the "Interpolation Syntax" page, but that format doesn't leave much room for details and usage examples. Now we give each function its own page, and categorize them for easier navigation. While many functions are very simple and don't really warrant a full page, certain functions do have additional details that are worth mentioning and this structure scales better for those more complicated functions. So far this includes only the numeric and string functions. Other categories will follow in subsequent commits.
2018-05-07 03:32:16 +02:00
---
migrate docs to mdx
2021-12-15 03:41:17 +01:00
page_title: log - Functions - Configuration Language
description: The log function returns the logarithm of a given number in a given base.
website: Beginnings of "Functions" configuration section Previously we just listed out all of the functions in alphabetical order inside the "Interpolation Syntax" page, but that format doesn't leave much room for details and usage examples. Now we give each function its own page, and categorize them for easier navigation. While many functions are very simple and don't really warrant a full page, certain functions do have additional details that are worth mentioning and this structure scales better for those more complicated functions. So far this includes only the numeric and string functions. Other categories will follow in subsequent commits.
2018-05-07 03:32:16 +02:00
---
# `log` Function
porting functions
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`log` returns the logarithm of a given number in a given base.
website: Beginnings of "Functions" configuration section Previously we just listed out all of the functions in alphabetical order inside the "Interpolation Syntax" page, but that format doesn't leave much room for details and usage examples. Now we give each function its own page, and categorize them for easier navigation. While many functions are very simple and don't really warrant a full page, certain functions do have additional details that are worth mentioning and this structure scales better for those more complicated functions. So far this includes only the numeric and string functions. Other categories will follow in subsequent commits.
2018-05-07 03:32:16 +02:00
```hcl
log(number, base)
```
## Examples
```
> log(50, 10)
1.6989700043360185
> log(16, 2)
4
```
`log` and `ceil` can be used together to find the minimum number of binary
digits required to represent a given number of distinct values:
```
> ceil(log(15, 2))
4
> ceil(log(16, 2))
4
> ceil(log(17, 2))
5
```