[Eeglablist] Merging two datasets with unequal numbers of events

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Thu Oct 27 19:29:17 PDT 2016


Dear Elizabeth,

> it looks like it wants to merge the files and insert a boundary event
halfway through (lines 224-228), which may be the problem with using two
files of unequal length. (Using EEGLab version 13.6.5.)

Well, usually the datasets you merge have different length, so that can't
be a cause of this issue.

I need more info to troubleshoot for you. How were the datasets generated?
Do they have same number of channels, channel names, sampling rate, etc...
these consistency is critical.

Makoto



On Wed, Oct 26, 2016 at 11:44 AM, Elizabeth Spencer Norton <
enorton at northwestern.edu> wrote:

> Hello,
>
> I'm trying to merge (concatenate) two datasets with different numbers of
> events. We run an oddball paradigm with randomly selected number of
> standards between deviants, and this is done in two runs that have
> different stimuli. I'm trying to concatenate the two runs using the GUI
> which calls pop_mergeset, but getting the error popup "EEGLAB error in
> function pop_mergeset() at line 275: Reference to non-existent field
> 'urevent'."
>
>
> Looking at the pop_mergeset script, it looks like it wants to merge the
> files and insert a boundary event halfway through (lines 224-228), which
> may be the problem with using two files of unequal length. (Using EEGLab
> version 13.6.5.)
>
>
> I'd prefer not to just lop off events from the longer dataset to make the
> sizes match. If anyone has ideas for other solutions, I would appreciate it!
>
> Best,
>
> Elizabeth Norton
>
> Northwestern University
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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