Calculates e^x - 1. For values of x close to 0, the exact sum of expm1(x) + 1 is much closer to the true result of e^x than exp(x).
| Parameter | Type | Required | Default | Description |
|---|---|---|---|---|
as | string | false | _expm1 | The name of the output field. |
field | string | true | The name of the input field. |