Calculates the arc tangent of a value; the returned angle is in the range -π/2 through π/2.

ParameterTypeRequiredDefault ValueDescription
asstringoptional[a]_arctan 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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