# p5.js | log() function

The log() function in p5.js is used to get the natural logarithm (of base “e”) of any number taken as input for the parameter of log() function.

Syntax:

`log(x)`

Parameters: This function accepts a single parameter x which is any number greater than zero (0) taken as the input whose natural log is going to be calculated.

Return Value: It returns the natual log of any input number greater than zero (0).

Below program illustrates the log() function in p5.js:

Example: This example uses log() function to get natural log value of any input number.

 `function` `setup() {  ` `  `  `    ``// Create Canvas of size 270*80  ` `    ``createCanvas(550, 130);  ` `}  ` `  `  `function` `draw() {  ` `      `  `    ``// Set the background color  ` `    ``background(220);  ` `      `  `    ``// Initialize the parameter  ` `    ``let a = 5;  ` `    ``let b = 7.7;  ` `    ``let c = 0; ` `    ``let d = -5; ` `      `  `    ``// Call to log() function  ` `    ``let v = log(a); ` `    ``let w = log(b); ` `    ``let x = log(c); ` `    ``let y = log(d); ` `      `  `    ``// Set the size of text  ` `    ``textSize(16);  ` `      `  `    ``// Set the text color  ` `    ``fill(color(``'red'``));  ` `    `  `    ``// Getting natural log value ` `    ``text(``"Natural logarithm value of 5 is : "` `+ v, 50, 30); ` `    ``text(``"Natural logarithm value of 7.7 is : "` `+ w, 50, 50); ` `    ``text(``"Natural logarithm value of 0 is : "` `+ x, 50, 70); ` `    ``text(``"Natural logarithm value of 5 is : "` `+ y, 50, 90); ` `       `  `}  `

Output: Note: If we take input as a negative value and zero then it returns output as “NaN” and -Infinity respectively.

Reference: https://p5js.org/reference/#/p5/log

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