[FieldTrip] Function is asking for raw data as input

[Soujata Borbaruah]

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.
>
>
>
> Sent with MailTrack
> <https://mailtrack.io/install?source=signature&lang=en&referral=s.borbaruah@student.utwente.nl&idSignature=22>
>
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