# Logarithm

> Supported in: Batch, Faster, Streaming

Calculates the natural logarithm, ln(x), of a column.

**Expression categories:** Numeric

## Declared arguments

* **Expression:** Expression to calculate natural logarithm of.<br>*Expression\<Numeric>*

**Output type:** *Double*

## Examples

### Example 1: Base case

**Argument values:**

* **Expression:** 10.123

**Output:** 2.3148100626166146

***

### Example 2: Null case

**Argument values:**

* **Expression:** *null*

**Output:** *null*

***