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).

ParameterTypeRequiredDefaultDescription
asstringfalse_expm1The name of the output field.
fieldstringtrue The name of the input field. [a]

[a] When you provide only one parameter, the implied parameter is field