Dear Vladimir,
Thanks for your response.According to your guidence,when trialduration<60,it works well.But ,when trailduration>60,the following error presents:
??? Index exceeds matrix dimensions (2).
Error in ==> file_array.subsasgn>subfun at 132
mat2file(sobj,dat,va{:});
Error in ==> file_array.subsasgn at 73
subfun(sobj,dat1,args{:});
Error in ==> meeg.clone at 35
d(end, end, end) = 0;
Error in ==> spm_eeg_epochs at 168
Dnew = clone(D, ['e' fnamedat(D)], [D.nchannels nsampl, ntrial])
This error I have encoutered similarly before when the converting data file is too big,which is fixed now.I wonder is this a time limit duration at the present time? It would be kind of you to give some solutions to solve this problem.
Thanks again!
haiteng
--
haiteng jiang
Research Center for Learning Science,
Southeast University
Si Pai Lou 2 # , Nanjing, 210096, P.R.China
Brain Imaging Lab
Email: [log in to unmask]
在2009-07-06?17:05:46，"Vladimir?Litvak"?<[log in to unmask]>?写道：
>Dear?Haiteng,
>
>Since?there?are?no?events?in?your?dataset,?it?is?not?possible?to
>define?trials?based?on?events.?The?error?you?are?reporting?is?a?little
>bit?strange,?but?in?any?case?you?can?epoch?your?file?using?a?short
>script,?something?like?the?following:
>
>D?=?spm_eeg_load
>
>trialduration?=?1;?%?sec
>
>trl?=?1:round(D.fsample*trialduration):D.nsamples;
>trl?=?trl(:);
>trl?=?[trl(1:(end-1))?trl(2:end)?-?1??ones(length(trl)-1,?1)];
>
>
>%?Epoching?continuous?M/EEG?data
>%?FORMAT?D?=?spm_eeg_epochs(S)
>%
>%?S?????????????????????-?input?structure?(optional)
>%?(optional)?fields?of?S:
>%???S.D?????????????????-?MEEG?object?or?filename?of?M/EEG?mat-file?with
>%?????????????????????????continuous?data
>%
>%?Either?(to?use?a?ready-made?trial?definition):
>%???S.epochinfo.trl?????????????-?Nx2?or?Nx3?matrix?(N?-?number?of?trials)
>%?????????????????????????????????[start?end?offset]
>%???S.epochinfo.conditionlabels?-?one?label?or?cell?array?of?N?labels
>
>S?=?[];
>S.D?=?D;
>S.epochinfo.trl?=?trl;
>S.epochinfo.conditionlabels?=?'Whatever';
>
>D?=?spm_eeg_epochs(S);
>
>
>Best,
>
>
>Vladimir
>
>
>2009/7/6?hiten?<[log in to unmask]>:
>>?Dear?SPMers:
>>??Now?,I?want?to?use?spm8?to?process?resting?state?MEG?data.?The?resting
>>?state?is?the?state?in?which?the?subjects?are?informed?to?hold??still?,keep
>>?their?eyes?closed?and?not?think?of?anything?in?particular.So?there?is?no
>>?trial?designed.Our?data?collection?last?for?120sec.?attachment?is?the?detail
>>?information?of?the?continuous?data?.when?go?to?epoching?step,?the?following
>>?error?appears:
>>????Reference?to?non-existent?field?'offset'.
>>?Error?in?==>?spm_eeg_definetrial?at?187
>>?????????????trlbeg?=?event(sel(j)).sample?-?event(sel(j)).offset?+?trloff;
>>?Error?in?==>?spm_eeg_epochs?at?101
>>?????[epochinfo.trl,?epochinfo.conditionlabels,?S]?=
>>?spm_eeg_definetrial(S_definetrial);
>>?????Error?using?==>?spm_eeg_epochs;
>>?Reference?to?non-existent?field?'offset'.
>>?????Error?while?evaluating?uicontrol?Callback
>>?could?anyone?give?some?suggestion?or?fix?the?problem??Thanks?in?advance!
>>
>>
>>?--
>>?haiteng??jiang
>>?Research?Center?for?Learning?Science,
>>?Southeast?University
>>?Si?Pai?Lou?2?#?,?Nanjing,?210096,?P.R.China
>>?Brain?Imaging??Lab
>>?Email:?jianghaiteng@126com
>>
>>
>>?________________________________
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