[FieldTrip] ft_channelrepair shows no effect at all

[Eelke Spaak]

Dear Katrin,

When I look at the data you've shown me, in fact I do see an effect of
ft_channelrepair. I run your code:

load ('ERP_Francesca17obs90_clean.mat')

%% Preparing neighbours for channel repair

cfg_neighb = [];
cfg_neighb.feedback = 'yes';
cfg_neighb.method = 'triangulation';
cfg_neighb.layout = 'GSN-HydroCel-129.sfp';
neighbours = ft_prepare_neighbours(cfg_neighb, obs90_data_clean2);

% Interpolate and put into new data structure
cfg = [];
cfg.badchannel = {'E49', 'E68'};
cfg.layout = 'GSN-HydroCel-129.sfp';
cfg.method = 'nearest';
cfg.neighbours = neighbours;
obs90_data_channelrepaired = ft_channelrepair(cfg,obs90_data_clean2);

followed by:

dat1=obs90_data_clean2;
dat2=obs90_data_channelrepaired;

x=dat1.trial{1}(68,:); % 68 is channel index of E68
y=dat2.trial{1}(68,:);
plot(x);hold on;plot(y,'r');

x=dat1.trial{1}(49,:);
y=dat2.trial{1}(49,:);
figure;
plot(x);hold on;plot(y,'r')

and the two figures that come up are shown in the attachments. The
original (blue) and channel-repaired (red) traces are clearly
different. These plots are for trial 1, but the same result holds when
I plot a different trial.

Does it work on your end too now?

Best,
Eelke

On 14 August 2014 08:57, Eelke Spaak <eelke.spaak at donders.ru.nl> wrote:
> OK just checking :) In that case, could you post a small snippet of
> data and the actual cfg you used (including which channels to repair)
> on e.g. dropbox or so? Then I can have a look.
>
> Best,
> Eelke
>
> On 13 August 2014 22:12, KatrinH Heimann <katrinheimann at gmail.com> wrote:
>> Dear Eelke, yes, sure, sorry, I did that. No effect.
>>
>>
>> 2014-08-13 21:55 GMT+02:00 Eelke Spaak <eelke.spaak at donders.ru.nl>:
>>
>>> Dear Katrin,
>>>
>>> Have you tried putting the labels of the channels you want interpolated
>>> into the cfg.badchannel array?
>>>
>>> Best,
>>> Eelke
>>>
>>> Op 13 aug. 2014 19:24 schreef "KatrinH Heimann" <katrinheimann at gmail.com>:
>>>>
>>>> Dear all. I am trying to replace bad channels.
>>>> This is my code (very basic I think):%% Preparing neighbours for channel
>>>> repair
>>>>
>>>>
>>>>
>>>> cfg_neighb          = [];
>>>>
>>>> cfg_neighb.feedback = 'yes';
>>>>
>>>> cfg_neighb.method   = 'triangulation';
>>>>
>>>> cfg_neighb.layout   = 'GSN-HydroCel-129.sfp';
>>>>
>>>> neighbours          = ft_prepare_neighbours(cfg_neighb, obs_data);
>>>>
>>>>
>>>>
>>>> % Interpolate and put into new data structure
>>>>
>>>>  cfg                      = [];
>>>>
>>>>  cfg.badchannel           = {};
>>>>
>>>>  cfg.layout               = 'GSN-HydroCel-129.sfp';
>>>>
>>>>  cfg.method               = 'nearest';
>>>>
>>>>  cfg.neighbours           = neighbours;
>>>>
>>>>  obs_data_channelrepaired       = ft_channelrepair(cfg,obs_data)
>>>>
>>>>
>>>> I do not get any error but fieldtrip even tells me that the interpolation
>>>> worked. However I do not see ANY trace of it in my data when inspecting it
>>>> afterwards. I also tried to change the method (to average) - no change.
>>>> Anybody who can help me with that?
>>>> Thanks a million
>>>> Katrin
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>> fieldtrip at donders.ru.nl
>>>> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>>
>>>
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>>
>>
>>
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