# Ln
<a name="ln-function"></a>

`ln` returns the natural logarithm of a given expression. 

## Syntax
<a name="ln-function-syntax"></a>

```
ln(expression)
```

## Arguments
<a name="ln-function-arguments"></a>

 *expression*   
The expression must be numeric. It can be a field name, a literal value, or another function.