[FieldTrip] ft_freqanalysis without ft_preprocessing

[Eelke Spaak]

'trial' and 'time' should be singular :)

Eelke
Op 29 jul. 2013 18:13 schreef "Alexis" <alexis.makin at liverpool.ac.uk> het
volgende:

> Hi, thanks for your reply,
>
> so that's what my data structure looks like.
>
> Is it common to use fieldtrip functions on data which has already been
> cleaned and epoched elsewhere?
>
> Alexis
>
> On 29 Jul 2013, at 16:51, Eelke Spaak wrote:
>
> Hi Alexis,
>
> How does your data structure look exactly? I.e. what does matlab display
> when you type 'data' at the prompt? The error message suggests that it is
> not yet quite in the appropriate fieldtrip format.
>
> Best,
> Eelke
> Op 29 jul. 2013 17:36 schreef "Alexis" <alexis.makin at liverpool.ac.uk> het
> volgende:
>
>> Hi
>>
>> I already have data which has been cleaned, filtered and artefact
>> rejected etc.
>>
>> It is now .mat format (trials X electrodes X time).
>>
>> I can follow the advice from the wiki below to make a structure which
>> should be compatible with ft_freqanalysis:
>>
>> Alternatively, if you already are able to read the data into Matlab, you
>> can reformat that data within Matlab into a datastructure that is
>> compatible with FieldTrip. Raw data that is comparable with the output of
>> preprocessing should consist of a structure with the fields
>>
>> data.label   % cell-array containing strings, Nchan X 1
>> data.fsample % sampling frequency in Hz, single number
>> data.trial   % cell-array containing a data matrix for each trial (1 X Ntrial), each data matrix is    Nchan X Nsamples
>> data.time    % cell-array containing a time axis for each trial (1 X Ntrial), each time axis is a 1 X Nsamples vector
>> data.trialinfo % this field is optional, but can be used to store trial-specific information, such as condition numbers, reaction times, correct responses etc. The dimensionality is N x M
>>
>>
>> but when I try to run ft_freqanalysis(cfg, data) on this
>>
>> I get the following error messages:
>>
>> ??? Error using ==> ft_checkdata at 366
>> This function requires raw, comp or mvar data as input.
>>
>> Error in ==> ft_freqanalysis at 219
>> data = ft_checkdata(data, 'datatype', {'raw', 'comp',
>> 'mvar'}, 'feedback', cfg.feedback, 'hassampleinfo', 'yes');
>>
>> How to I tell the ft_checkdata function what datatype I have? Is this a
>> simple problem?
>>
>> Is it common to use fieldtrip functions on data which has already been
>> preprocessed in another way? Or is this not advisable?
>>
>> cheers,
>>
>>
>> Alexis
>> alexis.makin at liv.ac.uk
>>
>> Network: www.liv.ac.uk/perception-action/
>>
>>
>>
>>
>> _______________________________________________
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>> fieldtrip at donders.ru.nl
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>>
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>
> Alexis
> alexis.makin at liv.ac.uk
>
> Network: www.liv.ac.uk/perception-action/
>
>
>
>
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