def plan_tr(p, *args, **kwargs):
    '''
    plan_tr(p, ...) yields a copy of plan p in which the afferent and efferent values of its
      functions have been translated. The translation is found from merging the list of 0 or more
      dictionary arguments given left-to-right followed by the keyword arguments. If the plan that
      is given is not a plan object explicitly, calc_tr will attempt to coerce it to one.
    '''
    if not is_plan(p):
        p = plan(p)
    return p.tr(*args, **kwargs)