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# 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 natural 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 the natural log value of any input number.

## Javascript

 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 the output as “NaN” and -Infinity respectively.

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

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