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p5.js | log() function
  • Last Updated : 15 Apr, 2020

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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