Should poisson be defined for negative lambda?

[denisalevi]

Should poisson be working for negative lamda? It currently returns 0. Not sure if this matters, was just surprised. np.random.poisson raises an error for lambda < 0.

from brian2 import *

set_device('cpp_standalone')

lamda = -1
G = NeuronGroup(5, 'x : integer')
G.run_regularly('''x = poisson(lamda)''')
run(defaultclock.dt)

[denisalevi]

Yeah, maybe really not important. Feel free to close this again. I was just a bit confused because the cuRAND host API fails for lambda <= 0. But I just saw that the device API on the other hand doesn't fail and returns 0 for lambda <= 0.