Calculates the arctangent of a number.
|number||a number, or an expression that evaluates to a number|
Number, with the same number of decimal places as number.
Use $atan to calculate the arctangent (in radians) of a number. The value returned by this function has the same number of decimal places as number.
let vAngle = $atan(0.500)
The preceding command sets the first element of array variable vAngle to 0.464.