[Eeglablist] Event type changes when exporting from EGI .RAW to BDF

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon May 19 19:34:11 PDT 2014

Dear Ramon,

Here is a data import issue. Could you take a look?


2014-05-18 15:28 GMT-07:00 Ana Laura Diez Martini <diezmartini at gmail.com>:

> Hello!
> I'm new both to EEGlab and Mathlab and I haven't been able to solve a
> problem.
> I'm using an EGI system in my new experiment and I used BIOSEMI for
> previous ones. My current output file is in .RAW format and I want to
> use my old scripts written for BDF files (I used Fieldtrip) to analyse
> this new data. The problem is, when I try to export it to BDF I get
> these warnings:
> Warning SOPEN (EDF-Write): relative scaling error is 2.636733e-05 (due
> to roundoff in PhysMax/Min)
> Warning SWRITE: 174 NaNs added to complete data block.
> Then the name of the triggers (the event type) changes completely.
> I don't know if this has anything to do with it but the trigger codes
> in my program (using Presentation) had this format: 11, 12, 13, 14,
> 15,21, 22...etc. However, Netstation codes them differently. For
> example trigger "11" would come out as 3 different events: 1,2,8, or
> "12" would be 4 and 8. So I have to use a piece of code to convert
> them to one event summing up the others with the same latency. I also
> tried exporting to BDF without this conversion and it won't work
> either. In any case, I need to export it to have the new event types
> saved.
> Just to clarify, again what I need is to get a BDF file from a .RAW
> file with the same events so I can use my old scripts. I'm sorry if
> I'm missing a lot from my lack of knowledge, I have been reading but I
> couldn't find anything to solve this.
> PS: Please let me know if I can upload any of my files to help
> understand my problem
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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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