weight_recorder does not work with connection types which use secondary events

[janhahne]

Recording the weights of a connection type that uses secondary events gives an empty list

Example script:

import nest
import pylab as plt
import numpy as np

n_in = nest.Create('hh_psc_alpha_gap', 1, params={'I_e': 200.})
n_out = nest.Create('hh_psc_alpha_gap', 1)
wr = nest.Create('weight_recorder')

nest.SetDefaults("gap_junction", {"weight_recorder": wr[0]})

nest.Connect(n_in, n_out, {"rule": "one_to_one", "make_symmetric": True}, {"model": "gap_junction", "weight": 1.})

nest.Simulate(100.)

print nest.GetStatus(wr, "events")[0]["weights"]

@weidel-p already found the reason:

The reason for this behavior is that the timestamp of SecondaryEvents is not set and therefore always 0 ms. As the weight_recorder is not active at a simulation time of 0ms, the event is not recorded (see models/weight_recorder.cpp).