[FieldTrip] reading .mat in fieldtrip

Thu Aug 11 23:38:33 CEST 2016

Thanks all,

The problem is fixed:

Here is the answer :

cfg = [];
cfg.demean = 'yes'; % base correction
data.trial{1,1} = eeg.eeg_data;

data.time{1,1} = 1:size(eeg.eeg_data,2);
data.label{1,1} = 'chan 1';
data.label{2,1} =  'chan 2';
data.label{3,1} = 'chan 3';
data.label{4,1} =  'chan 4';
data.label{5,1} = 'chan 5';
data.label{6,1} =  'chan 6';
data.label{7,1} = 'chan 7';
data.label{8,1} =  'chan 8';
data.fsample = eeg.samp_rate;

[data1] = ft_preprocessing (cfg, data);

_____
Bahar

________________________________
From: fieldtrip-bounces at science.ru.nl <fieldtrip-bounces at science.ru.nl> on behalf of Arjen Stolk <a.stolk8 at gmail.com>
Sent: Thursday, August 11, 2016 4:25 PM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] reading .mat in fieldtrip

Bahareh, according to http://www.fieldtriptoolbox.org/reference/ft_redefinetrial (or 'help ft_redefinetrial') cfg.trl should be
[http://www.fieldtriptoolbox.org/_media/logo-share.png]<http://www.fieldtriptoolbox.org/reference/ft_redefinetrial>

reference:ft_redefinetrial – FieldTrip<http://www.fieldtriptoolbox.org/reference/ft_redefinetrial>
www.fieldtriptoolbox.org
Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_redefinetrial”. FT_REDEFINETRIAL allows you to ...

[http://www.fieldtriptoolbox.org/_media/logo-share.png]<http://www.fieldtriptoolbox.org/reference/ft_redefinetrial>

reference:ft_redefinetrial – FieldTrip<http://www.fieldtriptoolbox.org/reference/ft_redefinetrial>
www.fieldtriptoolbox.org
Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_redefinetrial”. FT_REDEFINETRIAL allows you to ...

cfg.trl       = Nx3 matrix with the trial definition,

For example, according to the page mentioned earlier (I suggest you actually read it this time: http://www.fieldtriptoolbox.org/faq/how_can_i_import_my_own_dataformat)

cfg.trl = [1    100 -10;
           101  200 -10;
           201  300 -10];

In contrast, you specified
data.trial{1,1} = eeg.eeg_data;
cfg.trl = data.trial{1,1};

It's my guess that eeg.eeg_data is that 8x10350000 matrix you imported, meaning your cfg.trl specification is off (it should be Nx3).

2016-08-11 12:23 GMT-07:00 Bahareh Elahian (belahian) <belahian at memphis.edu<mailto:belahian at memphis.edu>>:

I did something and it works but it is not correct .

I specified cfg.trl = data.trial{1,1}

cfg = [];
cfg.bpfilter = 'yes';
cfg.demean = 'yes';
data.trial{1,1} = eeg.eeg_data;
cfg.trl = data.trial{1,1};
data.time{1,1} = 1:size(eeg.eeg_data,2);
data.label{1,1} = 'chan 1';
data.label{2,1} =  'chan 2';
data.label{3,1} = 'chan 3';
data.label{4,1} =  'chan 4';
data.label{5,1} = 'chan 5';
data.label{6,1} =  'chan 6';
data.label{7,1} = 'chan 7';
data.label{8,1} =  'chan 8';
data.fsample = eeg.samp_rate;
newdata = ft_redefinetrial(cfg,data);

the newdata.time and newdata.trial are  <1*8 cell > . some of the cells are empty and one is NAN.

________________________________
From: fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl> <fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl>> on behalf of Bahareh Elahian (belahian) <belahian at memphis.edu<mailto:belahian at memphis.edu>>
Sent: Thursday, August 11, 2016 2:00:52 PM

To: FieldTrip discussion list
Subject: Re: [FieldTrip] reading .mat in fieldtrip

Thanks but none of the options works.

The error is :

you should specify at least one configuration option.

Even cfg.demean = 'yes'; is not enough.

________________________________
From: fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl> <fieldtrip-bounces at science.ru.nl<mailto:fieldtrip-bounces at science.ru.nl>> on behalf of Antonio Rodriguez <toni.rbaena at gmail.com<mailto:toni.rbaena at gmail.com>>
Sent: Thursday, August 11, 2016 1:47:18 PM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] reading .mat in fieldtrip

Hi.

You can create an empty cfg structure, and fill with data :

cfg =[];
newdata = ft_redefinetrial(cfg,data);

El 11 ago. 2016 7:11 p. m., "Bahareh Elahian (belahian)" <belahian at memphis.edu<mailto:belahian at memphis.edu>> escribió:
Thanks for the answer,

I have had a look on this page before and I tried to follow the steps.
The problem is ;I do not have any cfg to define cfg.trl and use newdata = ft_redefinetrial(cfg,data);

Any other idea?

On Aug 11, 2016, at 11:36 AM, Arjen Stolk <a.stolk8 at gmail.com<mailto:a.stolk8 at gmail.com>> wrote:

Hi Bahareh,

To get you started, see this page:
http://www.fieldtriptoolbox.org/faq/how_can_i_import_my_own_dataformat

It describes what fieldtrip expects your raw data to look like.

Arjen

2016-08-11 8:42 GMT-07:00 Bahareh Elahian (belahian) <belahian at memphis.edu<mailto:belahian at memphis.edu>>:
Hi All,

I have a “.mat” file which contais: <8x10350000 double> and sampling rate.
How should I import this data to field trip? By using   [data] = ft_preprocessing( cfg);
  I am getting an error that the data should be in the format of raw or raw + comp.

Any idea?

Thanks!

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