[Eeglablist] Error while rejecting continuous data (eeglab 14)

Rafał Jończyk rafal.jonczyk at gmail.com
Mon Apr 17 10:45:22 PDT 2017


Dear all,

I have found a simple solution, but I'd like to get some feedback if this
does not negatively impact the EEG.event.structure in any way.
What I did was to write the following code:

EEG.event(1).type = num2str(EEG.event(1).type)

, which changes the first event in EEG.event.type structure field into a
string. Next, eeglab seems to automatically convert all the other events
into strings to make it a homogeneous array.

Would you say that is okay? I already checked, and I can insert boundary
events without any trouble.

Best,
Rafał

2017-04-15 11:55 GMT+02:00 Rafał Jończyk <rafal.jonczyk at gmail.com>:

> Dear Nicholas and Zahra,
>
> thank you for your feedback. I thought that the problem might lie in the
> numeric/string nature of events. I am a bit confused, though, because
> eeglab gave me a warning message a few times saying "converting all event
> types to strings" -- could it be that the conversion didn't work? Also do
> you know if there is a way to run such a conversion manually without doing
> any harm to the event structure? In other words -- is there an unambiguous
> and safe way to convert the numeric event types to string event types?
>
> Best,
> Rafal
>
>
> 2017-04-13 14:31 GMT+02:00 zahra fotovatnia <fotovatnia at yahoo.com>:
>
>> Hi Rafal,
>>
>> Yes. I found the same problem when using cleaning continuous data. The
>> point is I was trying to do difference waves on erplab after analyzing
>> continuous data on eeglab but I repeatedly found the error of missing data.
>> I tried different options but the same error. ASR deleted the events while
>> cleaning.
>>
>> Best
>> Zahra
>>
>>
>>
>>
>> On Thursday, 13 April 2017, 2:45, Rafał Jończyk <rafal.jonczyk at gmail.com>
>> wrote:
>>
>>
>> Thank you Tarik for advice. I will have a go at your suggestions. I think
>> there might be something with the latest version of eeglab given that I
>> have never experienced such problems in previous versions, and it's not the
>> first time that I am analyzing *cnt files from neuroscan in eeglab.
>>
>> Has anyone else experienced a similar problem?
>>
>> Best,
>> Rafał
>>
>> 2017-04-12 3:10 GMT+02:00 Tarik S Bel-Bahar <tarikbelbahar at gmail.com>:
>>
>> Hello Rafal, a few notes below that may help, all the best!
>>
>> ****************************** **
>> Yes you could try just changing the format of all the events by looping
>> through them and rewriting them.
>> It may not be about the numeric format, it may be how they are read
>> and/or stored (cell vs. strong array, or something basic like that).
>> See also addnewevents function mentioned on list previously, and some
>> related messages,
>> which may allow you to write in new events that are accepted by eeglab.
>> However, this may be problem with new build as you're seeing, thus a
>> bugzilla note would be cool when you have a chance.
>> Another thing to check is if the same thing happens with the eeglab
>> tutorial data too,
>> which would be telling if there's something unique about your data and/or
>> it's event structure.
>>
>>
>>
>>
>> On Tue, Apr 11, 2017 at 10:37 AM, Rafał Jończyk <rafal.jonczyk at gmail.com>
>> wrote:
>>
>> Dear eeglablist community,
>>
>> I have experienced some problems with event structure -- that's my guess
>> -- when rejecting fragments of continuous data (raw *.cnt files resampled
>> to 250Hz & filtered) in the latest version of eeglab. Interestingly, this
>> does not happen when I am using eeglab 13.6.5b on the same computer. Note
>> that I am not rejecting the onset of the data.
>>
>> The error:
>>
>> eeg_insertbound(): 3 boundary (break) events added.
>> eeg_insertbound(): 3 boundary (break) events added.
>> Warning: converting all event types to strings
>> BUG 1971 WARNING: IF YOU ARE USING A SCRIPT WITTEN FOR A PREVIOUS VERSION
>> OF
>> EEGLAB TO CALL THIS FUNCTION, BECAUSE YOU ARE REJECTING THE ONSET OF THE
>> DATA,
>> EVENTS WERE CORRUPTED. EVENT LATENCIES ARE NOW CORRECT (SEE https://sccn.ucsd.edu/wiki/EEG
>> LAB_bug1971 <https://sccn.ucsd.edu/wiki/EEGLAB_bug1971>);
>>
>> Error using cell/strmatch (line 19)
>> Requires character array or cell array of strings as inputs.
>>
>> Error in eeg_eegrej (line 147)
>>     indBound2 = strmatch('boundary', { event2(:).type });
>> Error while evaluating DestroyedObject Callback
>>
>>
>> Could you give me a hint how to resolve the problem and continue working
>> with the latest version of eeglab? Is it because my events are numeric?
>>
>> Best,
>> Rafał
>>
>> --
>> Rafał Jończyk
>> Assistant Professor
>> Faculty of English
>> Adam Mickiewicz University, Poznań | Poland
>>
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>>
>>
>>
>>
>> --
>> Rafał Jończyk
>> Assistant Professor
>> Faculty of English
>> Adam Mickiewicz University, Poznań | Poland
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>>
>
>
> --
> Rafał Jończyk
> Assistant Professor
> Faculty of English
> Adam Mickiewicz University, Poznań | Poland
>



-- 
Rafał Jończyk
Assistant Professor
Faculty of English
Adam Mickiewicz University, Poznań | Poland
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