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Bug 2304 - ft_databrowser trouble accessing visual artifacts

Reported 2013-09-27 08:12:00 +0200
Modified 2019-08-10 12:33:31 +0200
Product: FieldTrip
Component: core
Version: unspecified
Hardware: PC
Operating System: Windows
Importance: P3 normal
Assigned to: Roemer van der Meij
Depends on:
Blocks: 2314
See also:

Jörn M. Horschig - 2013-09-27 08:12:31 +0200

Created attachment 524 screenshot of the error During the stimulation toolkit, some participants encountered a strange problem with databrowser that jumping back and forth between marked epochs resulted in an error because the function wants to access the 0th element of a matrix. I attached a screenshot. I have no clue how they managed to get this error, but I remember that I could reproduce it by some randomly executing the zooming command, marking some epochs and jumping between the epochs. However, since it was during the toolkit, I did not spend more time with digging into the code. I would propose to play around with the toolkit data and the databrowser whilehaving enabled 'dbstop if error' and hope for the error to occur again.

Roemer van der Meij - 2013-09-27 11:54:55 +0200

Hmmm, that's weird indeed. Did you use a fieldtrip version prior to tuesday this week?

Jörn M. Horschig - 2013-09-27 13:12:52 +0200

the toolkit was beginning of September

Jan-Mathijs Schoffelen - 2013-10-10 10:55:38 +0200

Assigned to a named person, to push forward the resolution of this bug. Otherwise it just adds to the 'stuwmeer' of unassigned bugs, that nobody feels responsible for.

Roemer van der Meij - 2016-05-07 02:14:09 +0200

This bug has long since been gone, but surfaced in another form. I noticed flipping through artifacts worked very intermittently. Looking into this.

Roemer van der Meij - 2016-05-09 22:35:11 +0200

Pull requested. Artifact browsing works again, and is now robust to artifacts that overlap with multiple trials, and to artifacts not present in any trial.

Robert Oostenveld - 2019-08-10 12:33:31 +0200

This closes a whole series of bugs that have been resolved (either FIXED/WONTFIX/INVALID) for quite some time. If you disagree, please file a new issue on