double Trajectory::force(double nextTime, int nextEvent,
const vector<int>& ids, rng::RngStream* rng,
const void* pars)
{
// store this info so that it can be accessed by the model
curState.curBranch = ids;
curState.time = time;
curState.nextTime = nextTime-time;
// get the transition of the next event
const TransitionType* tt = model->getObsType(model->mapType(nextEvent));
// setup the transition
StateTransition st(nextTime-lastEventTime(),*tt,getState(),pars,nextEvent);
// probability that the event happened
double trueRate = 0.0;
double dw = tt->applyRate(curState,pars,trueRate);
// apply the branch changes
int ret = tt->applyBranch(curState,rng,st,pars);
// cerr << ">>>>> " << ret << endl;
if (ret < 0) {
// cerr << *this << endl;
// EpiState x = curState;
// x += st.getTrans();
// double dt = st.atTime();
// cerr << setw(12) << time+dt << " " << x << " ";
// cerr << " " << st;
// cerr << endl;
// return 0.0;
dw = 0.0;
} else if (ret < 100) {
// adjust the weight
dw *= exp(st.relprob);
}
if (store_trans) transitions.push_back(st);
// apply the state change
addTransition(st);
// cerr << "New branch State: " << curState.branches.to_json(false) << endl;
// update the time
time = nextTime;
return dw;
}
MSBoolean MSDoubleClick::isDoubleClick(const XEvent *ev_)
{
if (ev_->type==ButtonPress||ev_->type==ButtonRelease)
{
if (ev_->xbutton.time-lastEventTime()<=applicationDoubleClickInterval())
{
eventTime(0);
return MSTrue;
}
else
{
eventTime(ev_->xbutton.time);
return MSFalse;
}
}
else return MSFalse;
}
int Trajectory::step(double maxTime,
const void* pars,
rng::RngStream* rng,
bool adjZero)
{
// get array of next event rates
double nextTime = 0.0;
double transTime = 0.0;
double r = 0.0;
int nextEvent = 0;
int num_events = 0;
double dw = 0.0;
double rate = 0.0;
double unrate = 0.0;
int ret = 0;
const TransitionType* nextTrans;
// set time to EpiState
curState.time = time;
// calculate all rates
double totalRate = model->calculateTransRates(curState,transRates,trueRates);
double totalTrue = std::accumulate(trueRates.begin(),trueRates.end(),0.0);
while (ret <= 0) {
if (totalRate <= 0.0) {
time = maxTime;
ret = 4;
break;
}
// sample next event time
rng->uniform(1,&r);
nextTime = -1.0/totalRate * log(r);
if (time+nextTime < maxTime) {
// sample next event type and calculate rate of the event
nextEvent = model->chooseTransition(rng,transRates);
// get rate of chosen event (transRates is a cumulative array)
rate = transRates[nextEvent] - ((nextEvent>0) ? transRates[nextEvent-1] : 0.0);
// get the appropriate transition
nextTrans = model->getTType(nextEvent);
// - time interval
transTime = time+nextTime - lastEventTime();
// generate the transition
StateTransition st(transTime,*nextTrans,curState,pars,nextEvent,time+nextTime);
// get potential new state (without copying branch information)
EpiState newState;
newState.copyNoBranches(curState);
newState += st.trans;
// get probability of new state
newState.nextTime = nextTime;
dw = nextTrans->applyProb(newState,model->getPars());
if (dw > 0.0 || ! adjZero)
// check if the proposed state is feasible (prob > 0)
{
// if yes,
// add branch transformations
if (model->do_branches) {
curState.nextTime = nextTime;
nextTrans->applyBranch(curState,rng,st,pars);
dw *= exp(st.relprob);
}
// add transition to list
if (store_trans) transitions.push_back(st);
// adapt state
addTransition(st);
// multiply probability
updateProb(dw);
// updateLogProb(st.relprob);
// advance time
time += nextTime;
++num_events;
#ifdef DEBUG
if (ret < 0) {
cout << ascii::cyan << " legal event"
<< " (" << nextEvent << ")."
<< " w = " << dw << ", penalty = " << unrate
<< ", total rate = " << totalRate << "."
<< ascii::end << endl;
}
#endif
ret = 1; // exit loop
} else {
// if no,
// make this transition illegal in this particular step
#ifdef DEBUG
cout << ascii::cyan
<< " illegal event (" << nextEvent << ")."
<< " w = " << dw << ", penalty = " << rate
<< ", total rate = " << totalRate << "."
<< ascii::end << endl;
#endif
// adjust cumulative rates
for (size_t i = nextEvent; i < transRates.size(); ++i) {
transRates[i] -= rate;
}
totalRate = transRates.back();
// condition on not seeing this event
unrate += rate;
// redo loop with modified rates
ret = -1;
}
} else {
#ifdef DEBUG
if (ret < 0) {
cout << "No event. Total rate = " << totalRate << "." << endl;
}
#endif
nextTime = maxTime - time;
time = maxTime;
ret = 2; // exit loop
}
}
if (totalRate < 0.0) {
#ifdef DEBUG
cout << "\033[1;31m";
cout << "Negative rate (" << ret << "): " << totalRate
<< " ES = " << curState;
cout << "\033[0m" << endl;
#endif
return -1;
}
// condition on the illegal events ('prob' is in logarithmic scale)
// 'unrate' is the sum of all the rates that were conditioned on not
// happening
// if (unrate > 0.0)
{
// updateLogProb(-unrate*nextTime);
double dR = totalTrue - totalRate;
#ifdef DEBUG
if (dR != 0) {
cout << " difference in rates: " << totalTrue << " - " << totalRate << endl;
}
#endif
updateLogProb(-dR*nextTime);
}
return ret;
// return num_events;
// return (ret != 2) ? num_events : -2;
}
