private bool StudyFlashcard(StudentMemory mem, double t)
{
double r = calcR(mem, t);
if (rand.NextDouble() < r)
{
//win
int interval = 0;
if (mem.lossCount == 0)
{
mem.strength = calc.CalcWinStr(mem.strength);
interval = calc.CalcWinInterval(mem.strength, mem.lastInterval, mem.intervalCount++);
}
else
{
mem.strength = calc.CalcLossStr(mem.strength, mem.lossCount);
interval = calc.CalcLostInterval(mem.strength, mem.lastInterval, mem.intervalCount++);
}
mem.tNextReview = t + interval;
mem.tStart = t;
mem.lastInterval = interval;
mem.lossCount = 1;
mem.algoStrength++;
return(true);
}
else
{
mem.tStart = t;
mem.lossCount++;
return(false);
}
}
private static double calcR(StudentMemory mem, double t)
{
double deltaT = t - mem.tStart;
double r = NewMethod(mem, deltaT);
return(r);
}
private static double NewMethod(StudentMemory mem, double deltaT)
{
return(Math.Exp(-deltaT / (mem.algoStrength * 10)));
}