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Bug 642 - ft_channelselection cannot handle channelexclusion of channels denoted with a *

Reported 2011-05-05 09:53:00 +0200
Modified 2012-02-03 21:22:34 +0100
Product: FieldTrip
Component: core
Version: unspecified
Hardware: PC
Operating System: Windows
Importance: P1 major
Assigned to: Robert Oostenveld
Depends on:
See also:

Arjen Stolk - 2011-05-05 09:53:43 +0200

Replication of bug with MEG data: chans = ft_channelselection({'all','-MLC*'}, data.label) chans = ft_channelselection({'MEG','-MLC*'}, data.label) while chans = ft_channelselection({'all','-MLC'}, data.label) chans = ft_channelselection({'MEG','-MLC'}, data.label) work fine. The specific error is 'matrix index is out of range for deletion' and is related to the variable 'channel' at line 287.

Arjen Stolk - 2011-05-05 09:57:41 +0200

see discussion list mail by Eliezer Kanal: Hello fieldtrip - We have a Elekta Neuromag 306 scanner, and I'm trying to select only the gradiometers. The magnetometers are labeled 'MEGxxx1', where x can be any number, and the gradiometers are either 'MEGxxx2' or 'MEGxxx3'. However, using ft_channelselection results in the following error: ~~~~ >> ft_channelselection({'all','-STI*','-MEG*1'}, cfg.hdr.label) ??? Matrix index is out of range for deletion. Error in ==> ft_channelselection at 287 channel([ ~~~~ This error is somewhat complex, as I was able to determine that ft_channelselection recursively calls itself a number of times while running, and I was unable to figure out what is causing this problem. Any help would be appreciated. Thanks! Eliezer Kanal

Jörn M. Horschig - 2011-09-06 14:41:35 +0200

I was just browsing through some bugs, and saw that this has been an issue some while ago. I think I fixed this problem as well by fixing bug 670. Can someone check and verify?

Robert Oostenveld - 2011-11-23 09:05:55 +0100

All channel selections are working as expected. I have added a test script, see test_bug670. ip212-238-43-102> svn commit test/test_bug670.m ft_channel*m Sending ft_channelcombination.m Sending ft_channelselection.m Adding test/test_bug670.m Transmitting file data ... Committed revision 4790.