The atan function returns the trigonometric arc tangent (inverse tangent) of the number passed to it; that is, the angle whose tangent is equal to the given value. The result is expressed in radians. Radians can be converted to degrees by multiplying by 180 and dividing the result by the value of the constant pi.

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Examples:

on mouseUp
    put atan(1.0) into field "arcTan" --yields 0.785398
end mouseUp

The following example handler converts a value in radians to degrees and puts the result into a variable, which is then displayed using the answer command.

on radiansToDegrees
    put round((atan(var)*180)/pi) into theVar
    answer theVar
end radiansToDegrees

Usage:

Factor and expression yield numbers.

on mouseUp
    the atan of {factor}
    atan({expression})
end mouseUp