[FieldTrip] Averaging trials (ft_timelockanalysis)

[Roemer van der Meij]

Hi Fawzi,

If you do:
stat = ft_timelockstatistics(cfg,avgP300{:},avgnonP300{:})
It should work.
(this way the contents of each cell is used, instead the cell itself)

Best,
Roemer
On May 5, 2012 11:51 AM, "Hamza Fawzi Altakroury (Student)" <
hamzaf at sabanciuniv.edu> wrote:

> Hello again Stephen and for all,
>
> I could not find out how to enter the following sturct into the
> ft_timelockstatistics function
>
> The input is generated using the following loop:
>
> for i = 1:10
>     cfg = [];
>     cfg.trials = [(i-1)*10+1 : i*10];
>     avgnonP300{i} = ft_timelockanalysis(cfg,nonp300);
> end
>
> and
>
> for i = 1:10
>     cfg = [];
>     cfg.trials = [(i-1)*10+1 : i*10];
>     avgP300{i} = ft_timelockanalysis(cfg,p300);
> end
>
>
> Then I use
>
> cfg         = [];
> cfg.layout  = 'CTF275.lay';
> cfg.method  = 'crossvalidate';
> cfg.design  = [ones(10,1); 2*ones(10,1)]';
> stat = ft_timelockstatistics(cfg,avgP300,avgnonP300);
>
> I get the following error
>
> ??? Error using ==> ft_checkdata at 307
> This function requires timelock data as input.
>
> Error in ==> ft_timelockstatistics at 75
>   varargin{i} = ft_checkdata(varargin{i}, 'datatype', 'timelock',
> 'feedback',
>   'no');
>
> Error in ==> test05 at 11
> stat = ft_timelockstatistics(cfg,avgP300,avgnonP300);
>
>
> Any thoughts
>
> Hamza
>
>
> On Thu, May 3, 2012 at 12:28 PM, Hamza Fawzi Altakroury (Student) <
> hamzaf at sabanciuniv.edu> wrote:
>
>> Thanks a lot Stephen for your help,
>>
>> Hamza
>>
>>
>>
>> On Thu, May 3, 2012 at 12:20 PM, Stephen Whitmarsh <
>> stephen.whitmarsh at gmail.com> wrote:
>>
>>> Dear Hamza,
>>>
>>> Actually, the statistic functions DO accept cellstructures of
>>> datastructures, and what I suggested is therefor very convenient,
>>> especially in that regard.
>>> Please take a look at http://fieldtrip.fcdonders.nl/walkthrough. I
>>> would recommend walking through it from the beginning, but you could
>>> take a particular look at the statistics section. In there I try to
>>> explain the data structure handling in detail which deals with your
>>> question.
>>>
>>> Cheers,
>>> Stephen
>>>
>>> On 3 May 2012 11:09, Hamza Fawzi Altakroury (Student)
>>> <hamzaf at sabanciuniv.edu> wrote:
>>> > Hello again,
>>> >
>>> > But I need to process my data later by ft_timelockstatistics.
>>> > I don't think this funtion accepts cell containing many structs.
>>> >
>>> > I think its better to do average manually then call ft_lockanalysis,
>>> then
>>> > ft_timelockstatistics. Right?
>>> >
>>> > Hamza
>>> >
>>> >
>>> > On Thu, May 3, 2012 at 11:36 AM, Stephen Whitmarsh
>>> > <stephen.whitmarsh at gmail.com> wrote:
>>> >>
>>> >> Dear Hamza,
>>> >>
>>> >> Fieldtrip functions in generally do not work on several different
>>> >> 'sets' of data at the same time.
>>> >> Call the function you are using (e.g. ft_timelockanalysis) separately
>>> >> for every set of trials and if you want put the output in a
>>> >> matrix{1:10} of datastructures (e.g. timelock).
>>> >> You can easily put it in a loop. Something like this:
>>> >>
>>> >> for i = 1:10
>>> >>     cfg = [];
>>> >>     cfg.trials = [(i-1)*10+1 : i*10];
>>> >>     yourtimelockdata{i} = ft_function(cfg,yourdata)
>>> >> end
>>> >>
>>> >> Hope this helps,
>>> >> Stephen
>>> >>
>>> >>
>>> >> On 3 May 2012 10:23, Hamza Fawzi Altakroury (Student)
>>> >> <hamzaf at sabanciuniv.edu> wrote:
>>> >> > Hello,
>>> >> >
>>> >> > I want to average each 10 trials of 100 trials.
>>> >> > I don't know what to put in (cfg.trials)
>>> >> >
>>> >> > I tried cfg.trials = [1:10; 1:10]; and cfg.trials = [1:10; 11:20];
>>> >> >
>>> >> > It does not work?
>>> >> >
>>> >> > Note: at the end I want to have a cell of 10 matices, not just one
>>> >> > matrix.
>>> >> >
>>> >> > Any thoughts?
>>> >> >
>>> >> > Best,
>>> >> >
>>> >> > --
>>> >> > Hamza Fawzi Altakroury
>>> >> > Graduate student - MA
>>> >> > Faculty of Engineering and Natural Sciences
>>> >> > Sabancı University
>>> >> >
>>> >> > _______________________________________________
>>> >> > fieldtrip mailing list
>>> >> > fieldtrip at donders.ru.nl
>>> >> > http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>> >>
>>> >> _______________________________________________
>>> >> fieldtrip mailing list
>>> >> fieldtrip at donders.ru.nl
>>> >> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> > Hamza Fawzi Altakroury
>>> > Graduate student - MA
>>> > Faculty of Engineering and Natural Sciences
>>> > Sabancı University
>>> >
>>> > _______________________________________________
>>> > fieldtrip mailing list
>>> > fieldtrip at donders.ru.nl
>>> > http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>>
>>> _______________________________________________
>>> fieldtrip mailing list
>>> fieldtrip at donders.ru.nl
>>> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>>
>>
>>
>>
>> --
>> Hamza Fawzi Altakroury
>> Graduate student - MA
>> Faculty of Engineering and Natural Sciences
>> Sabancı University
>>
>
>
>
> --
> Hamza Fawzi Altakroury
> Graduate student - MA
> Faculty of Engineering and Natural Sciences
> Sabancı University
>
> _______________________________________________
> fieldtrip mailing list
> fieldtrip at donders.ru.nl
> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>
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