12, 14, 16, 18, 20, 22, 24, 10, 12, 14, 16, 18, 20, 22, 24], m0);
  }

  function testSubtract() {
    var m0 = goog.vec.Matrix4.createFromValues(
        1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16);
    var m1 = goog.vec.Matrix4.createFromValues(
        9, 10, 11, 12, 13, 14, 15, 16, 1, 2, 3, 4, 5, 6, 7, 8);
    var m2 = goog.vec.Matrix4.create();

    goog.vec.Matrix4.subtract(m0, m1, m2);
    assertElementsEquals(
        [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16], m0);
    asser