epochs.py 文件源码

def _evoked_from_epoch_data(self, data, info, picks, n_events, kind):
        """Helper to create an evoked object from epoch data"""
        info = deepcopy(info)
        evoked = EvokedArray(data, info, tmin=self.times[0],
                             comment=self.name, nave=n_events, kind=kind,
                             verbose=self.verbose)
        # XXX: above constructor doesn't recreate the times object precisely
        evoked.times = self.times.copy()

        # pick channels
        if picks is None:
            picks = _pick_data_channels(evoked.info, exclude=[])

        ch_names = [evoked.ch_names[p] for p in picks]
        evoked.pick_channels(ch_names)

        if len(evoked.info['ch_names']) == 0:
            raise ValueError('No data channel found when averaging.')

        if evoked.nave < 1:
            warn('evoked object is empty (based on less than 1 epoch)')

        return evoked