JS SVG getCTM and setCTM?

Question

If I use getCTM() to get the current tranformation matrix, how do I use that object to set the matrix if I want to restore it at a later point (I know about save and restore but

Answer 1

function setCTM(someitem,m) {
  return someitem.transform.baseVal.initialize(
    someitem.ownerSVGElement.createSVGTransformFromMatrix(m));
}

If, instead of saving someItem.getCTM(), you save someitem.transform.baseVal.getitem(0), you can use:

function setTransform(someitem,t) {
  return someitem.transform.baseVal.initialize(t));
}