[FieldTrip] Using PPC method

[马天阳]

Dear Andreas,

I still don't quite understand the tutorial.

spikeTrials =
         label: {'sig002a_wf'  'sig003a_wf'}
     timestamp: {[1x83601 int32
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/int32.html>]
 [1x61513 int32
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/int32.html>]}
      waveform: {[1x32x83601 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]
 [1x32x61513 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]}
          unit: {[1x83601 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]
 [1x61513 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]}
           hdr: [1x1 struct
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/struct.html>]
        dimord: '{chan}_lead_time_spike'
           cfg: [1x1 struct
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/struct.html>]
          time: {[1x83601 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]
 [1x61513 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]}
         trial: {[1x83601 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]
 [1x61513 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]}
     trialtime: [600x2 double
<http://www.mathworks.com/access/helpdesk/help/techdoc/ref/double.html>]

Like here, I don't know why for timestamp,time and trial, there are
same number of values. If I have one unit, 60 trials and focus on -0.5
s to 0.5 s around stimulus event, I think trial means which trial of
the 60 trials has spikes in this 1 s. The time means time point of
spikes located in the 1 s around stimulus for each trial. Is it
correct? But what about the timestamp? It means from the beginning of
recording to the end and has nothing to do with trials?

I feel I am quite lost.

Best,

Tianyang
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