Atn2

Return the inverse tangent (arctan) of a tangent value a/b. The inverse tangent is the angle measured in radians from the positive x-axis to a line whose endpoints are the origin and the Cartesian coordinates (b, a).

Syntax

Atn2(x, y)

Arguments

• x

  An integer or real number

• y

  A non-zero integer or real number

Returns

The inverse tangent in radians of the tangent value x/y

Exceptions

Returns an error if x or y is not an integer or real number

Example

Atn2(1,2)

• [Returns 0.46365]

  Atn2('att1', 'att2')

• [Return the inverse tangent in radians of the tangent value 'att1'/'att2' at trigger time]

  Atn2(TagVal('att1','y+8h'), TagVal('att2', 'y+8h'))

• [Return the inverse tangent in radians of the tangent value 'att1'/'att2' at 8am yesterday]