Hello Petia,

I am not quite sure if I understand your problem. The voltmeter records time, sender and voltage for each data point. In the following example, it records the voltage of two neurons. Then

voltmeter.get('events')

returns

{'senders': array([1, 2, 1, ..., 2, 1, 2]),
'times': array([  1.,  1.,  2., ..., 998., 999., 999.]),
'V_m': array([-68.56875477, -70.        , -67.27371053, ..., -69.89028023,
        -57.39686729, -69.90055242])}

Entries in the senders, times and V_m arrays correspond to each other, so you can group data by sender.

Also when recording to file, sender information is recorded:

# NEST version: 3.5
# RecordingBackendASCII version: 2
sender    time_ms    V_m
1    1.000    -68.569
2    1.000    -70.000
1    2.000    -67.274
2    2.000    -70.000
Hans Ekkehard
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