[FieldTrip] EEG -> Topographic Matrix
eelke.spaak at donders.ru.nl
Wed May 15 12:22:21 CEST 2013
Ah, I understand now; you want the interpolated matrix. This is not
possible with standard FieldTrip code.
However, it should not be very difficult to get this. I would
recommend to set a breakpoint in plotting/ft_plot_topo.m, at line 220.
Then, when the code breaks at that point, you can type in the command
window assignin('base','Xi',Xi) and the same for Yi and Zi, that way
you have the x and y coordinates and the data (z) in variables in your
Getting this matrix programmatically in a script should also be
possible, but that would require custom hacks of ft_plot_topo (e.g.
you could put this assignin call in your local copy of the function,
or add Xi,Yi,Zi as output arguments, etc.)
On 15 May 2013 12:08, Yoel Sher <yoel.sher at mail.huji.ac.il> wrote:
> Dear Eelke,
> First, thanks for you fast replay. Second, let me clarify my question. I'm
> looking for other result than the average ERP/ERF. I'm looking for a matrix
> that output the EEG value per each location (not just the electrodes) on the
> scalp. Of course that every location other than the electrode is an
> interpolated value. The plot of ft_topoplotER shows that matrix (but does
> not output, as far as I know).
> On 05/14/2013 08:25 PM, Eelke Spaak wrote:
>> Dear Yoel,
>> I'm not sure if I understand what you mean exactly, but do you simply
>> want the values plotted by ft_topoplotER in case of plotting the
>> results of ft_timelockanalysis? In that case, you can look at the
>> tl.avg field (if tl = ft_timelockanalysis(cfg, data)). But that seems
>> rather trivial, so I think you must mean something else.
>> On 14 May 2013 18:09, Yoel Sher <yoel.sher at mail.huji.ac.il> wrote:
>>> Dear FieldTrippers,
>>> I would like to know if there is an option to extract the Topographic map
>>> (Such as the scalp in ft_topoplotER) to a matrix. I've searched around
>>> functions in fieldtrip and couldn't find any..
>>> Many Thanks,
>>> fieldtrip mailing list
>>> fieldtrip at donders.ru.nl
>> fieldtrip mailing list
>> fieldtrip at donders.ru.nl
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