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p5.js | log() function

  • Last Updated : 17 Aug, 2021

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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