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

var transform = ownerSVGElement.createSVGTransform()

transform.setMatrix(elem.getCTM())

someelement.transform.baseVal.initialize(transform)