Mercurial > hg > nsaunier > traffic-intelligence
diff python/traffic_engineering.py @ 479:7828fec8bbd2
added function to generate headways based on flow or mean headway over some simulation period
| author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
|---|---|
| date | Mon, 31 Mar 2014 16:20:13 -0400 |
| parents | 539e2b4cfaa3 |
| children | 850ed17c7b2f |
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--- a/python/traffic_engineering.py Thu Mar 27 11:40:28 2014 -0400 +++ b/python/traffic_engineering.py Mon Mar 31 16:20:13 2014 -0400 @@ -12,6 +12,20 @@ # Simulation ######################### +def generateTimeHeadways(meanTimeHeadway, simulationTime): + '''Generates the time headways between arrivals + given the meanTimeHeadway and the negative exponential distribution + over a time interval of length simulationTime (assumed to be in same time unit as headway''' + from random import expovariate + headways = [] + totalTime = 0 + flow = 1/meanTimeHeadway + while totalTime < simulationTime: + h = expovariate(flow) + headways.append(h) + totalTime += h + return headways + class Vehicle: '''Generic vehicle class 1D coordinates for now'''