Please note, this is a STATIC archive of website www.w3resource.com from 19 Jul 2022, cach3.com does not collect or store any user information, there is no "phishing" involved.
w3resource

JavaScript: Returns n rows by n columns identity matrix

JavaScript Function: Exercise-10 with Solution

Write a JavaScript function which returns the n rows by n columns identity matrix.

Pictorial Presentation:

JavaScript: Returns n rows by n columns identity matrix

Sample Solution: -

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Returns the n rows by n columns identity matrix</title>
</head>
<body>
  
</body>
</html>

JavaScript Code:

function matrix(n) {

        var i;
        var j;

        for (i=0; i < n; i++)
        {
          for (j=0; j < n; j++)
          {
               if (i === j)
               {
                
                 console.log(' 1 ');
               }
                      
               else 
                {
                 console.log(' 0 ');}
                }
             console.log('----------');
           }
       }
matrix(4);

Sample Output:

 1 
 0 
 0 
 0 
----------
 0 
 1 
 0 
 0 
----------
 0 
 0 
 1 
 0 
----------
 0 
 0 
 0 
 1 
----------

Flowchart:

Flowchart: JavaScript function: Returns n rows by n columns identity matrix

Live Demo:

See the Pen JavaScript -Returns n rows by n columns identity matrix-function-ex- 10 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function which accepts an argument and returns the type.
Next: Write a JavaScript function which will take an array of numbers stored and find the second lowest and second greatest numbers, respectively.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04