# ln

## Returns the natural logarithm of the input
value.

**Syntax:**

ln(n);

Argument |
Description |

n |
The input value. |

**Returns:** Real

### Description

The natural logarithm `ln(n)` is the amount of time
needed to reach a certain level of continuous growth, where n is
the level reached. So if we want to find out how many time units we
need to get 20 growth we would use `ln(20)` which returns
2.99 units of time to get that amount of growth.

**Example:**

alarm[0] = ln(age) * room_speed;

The above code uses the natural logarithm of the value stored in
the variable "age" to set an alarm.

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