atan()

Usage

-- Lingo syntax
(number).atan
atan (number)
// JavaScript syntax
Math.atan(number);
                                                

Description

Math function (Lingo only); calculates the arctangent, which is the angle whose tangent is a specified number. The result is a value in radians between pi/2 and +pi/2.

In JavaScript syntax, use the Math object’s atan() function.

Parameters

None.

Example

This statement displays the arctangent of 1:

(1).atan
                                                

The result, to four decimal places, is 0.7854, or approximately pi/4.

Most trigonometric functions use radians, so you may want to convert from degrees to radians.

This handler lets you convert between degrees and radians:

-- Lingo syntax
on DegreesToRads degreeValue
	return degreeValue * PI/180
end

// JavaScript syntax
function DegreesToRads(degreeValue) {
	return degreeValue * PI/180
}
                                                

The handler displays the conversion of 30 degrees to radians in the Message window:

put DegreesToRads(30)
-- 0.5236