void ApoptoticCellKiller<SPACE_DIM>::CheckAndLabelSingleCellForApoptosis(CellPtr pCell)
{
if (pCell->HasCellProperty<ApoptoticCellProperty>() && !(pCell->HasApoptosisBegun()))
{
pCell->StartApoptosis();
}
}
void RandomCellKiller<DIM>::CheckAndLabelSingleCellForApoptosis(CellPtr pCell)
{
/*
* We assume a constant time step and that there are an integer number (n = 1/dt)
* of time steps per hour. We also assume that this method is called every time step
* and that the probabilities of dying at different times are independent.
*
* Let q=mProbabilityOfDeathInAnHour and p="probability of death in a given time step".
*
* Probability of not dying in an hour:
* (1-q) = (1-p)^n = (1-p)^(1/dt).
*
* Rearranging for p:
* p = 1 - (1-q)^dt.
*/
double death_prob_this_timestep = 1.0 - pow((1.0 - mProbabilityOfDeathInAnHour), SimulationTime::Instance()->GetTimeStep());
if (!pCell->HasApoptosisBegun() &&
RandomNumberGenerator::Instance()->ranf() < death_prob_this_timestep)
{
pCell->StartApoptosis();
}
}