---
name: "BIS_fnc_berp"
type: function
status: ok
groups: ["Interpolation"]
arma3_since: "1.78"
locality: {"argument": null, "effect": null, "server_exec": false}
source: https://community.bistudio.com/wiki/BIS_fnc_berp
revid: 338047
updated: 2023-02-23T21:15:20Z
---

# BIS_fnc_berp

*Function · Interpolation · Arma 3 v1.78*

## Description

Derivative of the [Kelvin function](https://en.wikipedia.org/wiki/Kelvin_functions) [ber](https://en.wikipedia.org/wiki/Kelvin_functions#ber(x)).

## Syntax

```sqf
[a, b, delta] call BIS_fnc_berp
```

**Parameters:**

- `a`: [Number](../topics/Number.md) - (Optional, default 0) first point (start)
- `b`: [Number](../topics/Number.md) - (Optional, default 0) second point (end)
- `delta`: [Number](../topics/Number.md) - (Optional, default 0) the delta time, 0..1

**Returns:** [Number](../topics/Number.md) - the interpolated value

## Examples

### Example 1

```sqf
private _value = [0, 1, 0.5] call BIS_fnc_berp;
```

## See also

[BIS_fnc_berpVector](../functions/BIS_fnc_berpVector.md)

<sub>Source: [BI Community Wiki — BIS fnc berp](https://community.bistudio.com/wiki/BIS_fnc_berp) (revision 338047).</sub>