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# Initialize the required values
# Get the domain "HY_Domain01" and its particles, get the emitter "HY_Emitter01"
# Read out the emitter's "Speed" parameter and the current number of particles
hybridoDomain    = scene.get_HY_GridDomain("HY_Domain01")
hybridoEmitter   = scene.get_HY_Emitter("HY_Emitter01")
hybridoParticles = hybridoDomain.getParticles()
emitterSpeed     = hybridoEmitter.getParameter("Speed")
numOfParticles   = len(hybridoParticles)
currentVelocity  = 0.0
maxSpeed         = 5.0

# Sum up all velocities
for particle in hybridoParticles:
	currentVelocity += particle.getVelocity().module()

# Calculate average velocity and avoid illegal division by zero:  
if (numOfParticles > 0):
	averageVelocity = currentVelocity / float(numOfParticles)
# Check, if average velocity is greater than current emitter speed and smallerless than the given speed limit "maxSpeed" 
if (averageVelocity > emitterSpeed and averageVelocity <= maxSpeed):
	hybridoEmitter.setParameter("Speed", averageVelocity)