GetEventFactor

GETEVENTFACTOR determine scale factor and release codes for next hinge formation
  [SCALE,MPRI,MPRJ] = GETEVENTFACTOR (Q,DQ,MP,MPRI,MPRJ)
  the function determines the scale factor SCALE and the hinge release codes MPRI and MPRJ
  for nodes i and j of a 2-node element under the assumption of elastic-perfectly plastic
  behavior; the scale factor for the next event and the corresponding plastic hinge release
  codes depend on the basic force vector Q and its increment DQ, on the plastic moment
  capacity MP and on the current release codes of the plastic hinges MPRI and MPRJ;
  for the release code 0 stands for closed or elastic hinge and 1 for open or plastic
  ASSUMPTION: the element has a single plastic moment capacity MP