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).

ParameterTypeRequiredDefault ValueDescription
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.

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