/// <summary>
/// did the other atom occur at the same time as this one?
/// if so return an atom representing the overlap
/// </summary>
/// <param name="other_atom"></param>
public eventTemporal AtSameTime(eventTemporal other_atom)
{
eventTemporal overlap = null;
if ((this.start_time >= other_atom.start_time) &&
(this.start_time <= other_atom.end_time))
{
overlap = new eventTemporal(this.start_time, other_atom.end_time);
}
if ((this.end_time >= other_atom.start_time) &&
(this.end_time <= other_atom.end_time))
{
overlap = new eventTemporal(other_atom.start_time, this.end_time);
}
if ((this.start_time >= other_atom.start_time) &&
(this.end_time <= other_atom.end_time))
{
overlap = new eventTemporal(this.start_time, this.end_time);
}
if ((other_atom.start_time >= this.start_time) &&
(other_atom.end_time <= this.end_time))
{
overlap = new eventTemporal(this.start_time, this.end_time);
}
return(overlap);
}
/// <summary>
/// did this atom occur after the given one
/// if so return the time difference
/// </summary>
/// <param name="other_atom"></param>
public TimeSpan After(eventTemporal other_atom)
{
TimeSpan time_difference = TimeSpan.Zero;
if (this.start_time > other_atom.end_time)
time_difference = this.start_time.Subtract(other_atom.end_time);
return(time_difference);
}
public nodeTemporal(DateTime start_time, DateTime end_time)
{
SetFlag(atom.FLAG_TEMPORAL);
node_event = new eventTemporal(start_time, end_time);
}
public nodeTemporal()
{
SetFlag(atom.FLAG_TEMPORAL);
node_event = new eventTemporal();
}
/// <summary>
/// returns the time difference between this and another temporal atom
/// </summary>
/// <param name="other_atom"></param>
public TimeSpan TimeDifference(eventTemporal other_atom)
{
TimeSpan time_difference = other_atom.start_time.Subtract(this.end_time);
return(time_difference);
}
/// <summary>
/// returns the weight plasticity in the range -1 <= w <= 1 according to an STDP rule
/// </summary>
/// <param name="other_atom"></param>
/// <param name="association_time_period_mS">the time period within which the weight is sensitive to being changed</param>
public float SpikeTimeDependentPlasticity(eventTemporal other_atom,
float association_time_period_mS)
{
float weight_plasticity = 0;
const float max_weight_value = 1.0f;
TimeSpan s = TimeDifference(other_atom);
if (s.TotalMilliseconds < 0)
weight_plasticity = max_weight_value * (float)Math.Exp(s.TotalMilliseconds / association_time_period_mS);
else
weight_plasticity = max_weight_value * (float)Math.Exp(s.TotalMilliseconds / (association_time_period_mS*2));
return(weight_plasticity);
}
/// <summary>
/// did this atom occur before the given one
/// if so return the time difference
/// </summary>
/// <param name="other_atom"></param>
public TimeSpan Before(eventTemporal other_atom)
{
TimeSpan time_difference = TimeSpan.Zero;
if (this.end_time < other_atom.start_time)
time_difference = other_atom.start_time.Subtract(this.end_time);
return(time_difference);
}