<html>
<head>
<script language="JavaScript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjs/3.2.1/math.js"></script>
</head>
<body>
<p id="result">loading result...</p>
<script>
var inverted = math.inv([[1,2,4],[3,4,5],[7,8,9]]);
document.getElementById("result").textContent = JSON.stringify(inverted);
</script>
</body>
</html>
This is what I have using math.js but I'm curious as to how i can do this without using a library.
Make sure matrix is "full" as in: no missing values.
The following code works on matrices with row count!=column count as well.
var originalMatrix=[[1,2,3],[4,5,6],[7,8,9]];
function invertMatrix(matrix) {
return matrix.reduce(
(acc, cv)=> {
cv.reduce(
(acc2, cv2, idx2)=> {
if(acc[idx2]==undefined) acc[idx2]=[];
acc[idx2].push(cv2);
},[]
);
return acc;
},[]
);
};
console.log(originalMatrix);
console.log(invertMatrix(originalMatrix));
console.log(invertMatrix(invertMatrix(originalMatrix)));
var anotherMatrix=[[1,2,3],[4,5,6],[7,8,9],[10,11,12],[13,14,15]];
console.log(anotherMatrix);
console.log(invertMatrix(anotherMatrix));
console.log(invertMatrix(invertMatrix(anotherMatrix)));
.as-console-wrapper { max-height: 100% !important; top: 0; }