# Logarithm with base

> Supported in: Batch, Faster, Streaming

Calculates logarithm with a given base.

**Expression categories:** Numeric

## Declared arguments

* **Base:** *no description*<br>*Literal\<Double>*
* **Expression:** *no description*<br>*Expression\<Numeric>*

**Output type:** *Double*

## Examples

### Example 1: Base case

**Argument values:**

* **Base:** 2.0
* **Expression:** 8

**Output:** 3.0

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### Example 2: Null case

**Argument values:**

* **Base:** 2.0
* **Expression:** *null*

**Output:** *null*

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