Calculates ex - 1. For values of x close to 0, the exact sum of expm1(x) + 1 is much closer to the true result of ex than exp(x).

ParameterTypeRequiredDefaultDescription
asstringoptional[a]_expm1 The name of the output field.
field[b]stringrequired  The name of the input field.

[a] Optional parameters use their default value unless explicitly set

[b] The argument name field can be omitted.

Omitted Argument Names

The argument name for field can be omitted; the following forms of this function are equivalent:

logscale
math:expm1("value")

and:

logscale
math:expm1(field="value")