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#행렬의 곱셈 식 : 2X2 , 3X3 의 행렬 곱셈 식

            var a = [ [2,1], [8,6] ];
            var b = [ [1,5], [1,9] ];
            var matrixLine = a.length;//행렬의 크기
            var arr = [];
            for(var i = 0; i < matrixLine; i++)
            {
                arr[i] = [];
            }

            for(var k = 0; k < matrixLine; k++)
            {
                for(var x = 0; x < matrixLine; x++)
                {
                    var temp = 0;
                    for(var y = 0; y < matrixLine; y++)
                    {
                        temp += (a[y][k] * b[x][y]);
                    }
                    arr[x][k] = temp;
                }
            }
            return arr;