def METHOD_NAME():
  try:
    # defining expressions {
    # Creating a new expression
    OpenDatabase("~juanita/silo/stuff/noise.silo")
    AddPlot("Pseudocolor", "hardyglobal")
    DrawPlots()
    DefineScalarExpression("newvar", "sin(hardyglobal) + cos(shepardglobal)")
    ChangeActivePlotsVar("newvar")
    # defining expressions }
    TestValueEQ('defining expressions error message',GetLastError(),'')
    TestPOA('defining expressions exceptions')
  except Exception as inst:
    TestFOA('defining expressions exception "%s"'%str(inst), LINE())
    pass
  vqr_cleanup()