A-M baby

Task/Matrix-multiplication/JavaScript/matrix-multiplication.js

@@ -0,0 +1,23 @@
+// returns a new matrix
+Matrix.prototype.mult = function(other) {
+    if (this.width != other.height) {
+        throw "error: incompatible sizes";
+    }
+
+    var result = [];
+    for (var i = 0; i < this.height; i++) {
+        result[i] = [];
+        for (var j = 0; j < other.width; j++) {
+            var sum = 0;
+            for (var k = 0; k < this.width; k++) {
+                sum += this.mtx[i][k] * other.mtx[k][j];
+            }
+            result[i][j] = sum;
+        }
+    }
+    return new Matrix(result);
+}
+
+var a = new Matrix([[1,2],[3,4]])
+var b = new Matrix([[-3,-8,3],[-2,1,4]]);
+print(a.mult(b));