[FieldTrip] Function is asking for raw data as input

[Soujata Borbaruah]

Dear Tineke,

Many many thanks for the suggestion. It works now, however, instead of
averaging trials in the three channels that is listed in cfg.channel, the
script is performing the averaging in all 64 channels. Is it possible to
correct it?

After the script is executed, cfg contains a cell called channels with 6x1
cell and another cell called channel with 64x1 cell. I think the script is
taking the data from channel.

Regards,
Soujata



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On Tue, May 10, 2016 at 11:27 AM, Soujata Borbaruah <
s.borbaruah at student.utwente.nl> wrote:

> Dear Tineke,
>
> I have created a function that performs timelock analysis on trials
> present in Dat which is obtained from Data of a subject.
>
> Script Average calls the function:
>
> Sub                         = 'Subject1'; % Need to perform for all the
> subjects
> load(['MTT_EP_data_',Sub,'.mat']);
>
> [ep] = Actual_Timelockanalysis_MTT_EP(Data)
>
>
> function [EP] = Actual_Timelockanalysis_MTT_EP(Data)
>
> cfg = [];
> cfg.channels = {'Cz';'M1';'M2'};
>
> for i = 1; % Only for NOP=1
>     S = unique(Data(i).Stimuli); % To find the unique stimuli
>           for j = 1:length(S)
>                   Indices = find(Data(i).Stimuli == S(j)); % comparison
>                   Idx{1} = 1:length(Indices); % Trials per amplitude, both
> perceived and not perceived
>                   for k = 1;
>                     Dat(i,j,k).Stimuli = S(j); % Corresponding unique
> stimuli
>                     Dat(i,j,k).Trial = Data(i).Trials(Indices(Idx{k})); %
> Extract the trials from Data(1).Trials and place in the new Dat structure
>                     Dat(i,j,k).Time = repmat({Data(i).TrialTime}, [1
> length(Idx{k})]); %represents 1 trial as a whole (9th trial took that much
> of time)
>                     Dat(i,j,k).fsample = Data(i).fsample;
>                     Dat(i,j,k).Label = Data(i).EEGlabels; % Contains all
> the 64 channels and the selection of the channels can be done using
> cfg.channels
>
>                     if ~isempty(Idx{1})
>                         EP{i,j}.All = ft_timelockanalysis(cfg,Dat(i,j));
>                     else
>                         EP{i,j} = [];
>
>                     end
>                     end
>                 end
>           end
>
> Dat is supposed to be a 1x10 (because there are 10 unique stimuli)
> structure with 5 fields which are:
> 1. Type of stimuli
> 2. Number of trials for the respective stimuli (64x4000 double for each
> trial)
> 3. Time of the trials (1x4000 double which is the same for every trial)
> 4. fsample (1000)
> 5. Labels of the EEG (64 channels).
>
> The Dat structure is created, however when the data in it is called for
> timelockanalysis, it fails and the warning says it is not raw data.
>
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>
> On Tue, May 10, 2016 at 10:34 AM, Snijders, T.M. (Tineke) <
> tineke.snijders at donders.ru.nl> wrote:
>
>> Dear Soujata,
>>
>> Have you checked what data is in Dat(i,j,k)? The data input of
>> ft_timelockanalysis should be organised in a structure as obtained from
>> ft_preprocessing, with trial-based data.
>>
>> Best,
>> Tineke
>>
>>
>>
>> ------------------------------
>> *From:* fieldtrip-bounces at science.ru.nl [fieldtrip-bounces at science.ru.nl]
>> on behalf of Soujata Borbaruah [s.borbaruah at student.utwente.nl]
>> *Sent:* Tuesday, May 10, 2016 10:00 AM
>> *To:* fieldtrip, donders
>> *Subject:* [FieldTrip] Function is asking for raw data as input
>>
>> Hello, I am working on statistical analysis of EEG data from subjects. I
>> am trying to perform time lock analysis on the data available but while
>> executing the script these are the following errors I get:
>>
>> Error using ft_checkdata (line 464)
>> This function requires raw+comp or raw data as input.
>>
>> Error in ft_timelockanalysis (line 106)
>> data = ft_checkdata(data, 'datatype', {'raw+comp', 'raw'}, 'feedback',
>> 'yes', 'hassampleinfo', 'yes');
>>
>> Error in Actual_Timelockanalysis_MTT_EP (line 20)
>>                         EP{i,j,k}.All =
>> ft_timelockanalysis(cfg,Dat(i,j,k));
>>
>> Error in Noise_MTT_EP (line 8)
>> [ep] = Actual_Timelockanalysis_MTT_EP(Data)
>>
>> Please let me know if you require any more information.
>>
>>
>>
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>>
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>
>
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