Reproducibility Strangeness

[noqsi]

The reproducibility of the noiseless output in successive runs depends on whether you write the simulated data out.

The following script yields the same results in the "noiseless" output file if you run it twice. However, if you remove the line inputs['expose']['writesimulated']=False, successive runs will yield slightly different images.

from SPyFFI.Observation import Observation, default

# start from the default settings
inputs = default

inputs['camera']['label'] = 'teensynoiseless'
inputs['camera']['subarray'] = 100
inputs['catalog']['name'] = 'sky'
inputs['expose']['skipcosmics'] = True
inputs['expose']['jitter'] = False
inputs['expose']['writenoiseless']=True
inputs['expose']['writesimulated']=False
inputs['catalog']['lckw']['fractionofstarswithlc'] = 0
inputs['catalog']['lckw']['fractionwithextremelc'] = 0
inputs['catalog']['lckw']['fractionwithtrapezoid'] = 0
inputs['catalog']['lckw']['fractionwithrotation'] = 0
inputs['catalog']['lckw']['fractionwithcustom'] = 0
inputs['jitter']['amplifyinterexposurejitter'] = 0.0
inputs['camera']['variablefocus'] = False
inputs['camera']['aberrate'] = False
inputs['observation']['cadencestodo'] = {1800:14*48}
Observation(inputs).create()