# formulas.elastic_set()

Elastic compression term of the Danish formula.

Usage

[Source](https://github.com/lornearnold/driven-pile/blob/main/src/driven_pile/formulas.py#L8-L26)

``` python
formulas.elastic_set(
    stroke,
    ram_weight,
    pile,
)
```

## Parameters

`stroke: array_like`  
Hammer stroke, ft.

`ram_weight: float`  
Ram weight, kips.

`pile: Pile`  
Pile geometry and modulus.

## Returns

`ndarray`  
`s0 = sqrt(W h L / (2 A E))`, ft.