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:
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:
Live Demo:
See the Pen JavaScript -Returns n rows by n columns identity matrix-function-ex- 10 by w3resource (@w3resource) on CodePen.
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Next: Write a JavaScript function which will take an array of numbers stored and find the second lowest and second greatest numbers, respectively.
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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
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