# p5.js atan() Function

The atan() function in p5.js is used to calculate the inverse of tan() or arc tangent of a value ranging in between -Infinity to Infinity (exclusive) and gives result in the range of -π/2 to π/2. Syntax:
`atan(P)`
Parameters: This function accepts a parameter “P” which is a value ranging from -1 to 1 and whose arc tangent is calculated. Return Value: It returns the arc tangent of a value and its range is in between -π/2 to π/2. Below program illustrates the atan() function in p5.js: Example: This example uses atan() function to get arc tangent of a value.
 `function` `setup() {  `` ` `    ``// Create Canvas of size 270*80  ``    ``createCanvas(550, 130);  ``}  `` ` `function` `draw() {  ``     ` `    ``// Set the background color  ``    ``background(220);  ``     ` `    ``// Initialize the parameter with some values ``    ``let a = 0;  ``    ``let b = 88;  ``        ``let c = -1; ``        ``let d = -0.5; ``        ``let e = 5; ``     ` `    ``// Call to atan() function  ``    ``let v = atan(a); ``        ``let w = atan(b); ``        ``let x = atan(c); ``        ``let y = atan(d); ``        ``let z = atan(e); ``     ` `    ``// Set the size of text  ``    ``textSize(16);  ``     ` `    ``// Set the text color  ``    ``fill(color(``'red'``));  ``   ` `    ``// Getting arc tangent value  ``    ``text(``"Arc tangent value of 0 is : "` `+ v, 50, 30); ``        ``text(``"Arc tangent value of 88 is : "` `+ w, 50, 50); ``        ``text(``"Arc tangent value of -1 is : "` `+ x, 50, 70); ``        ``text(``"Arc tangent value of -0.5 is : "` `+ y, 50, 90); ``        ``text(``"Arc tangent value of 5 is : "` `+ z, 50, 110);      ``}  `

Output: Reference: https://p5js.org/reference/#/p5/atan

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