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Bug 860 - ft_neighbourplot crashes

Reported 2011-08-03 16:22:00 +0200
Modified 2011-09-06 14:37:08 +0200
Product: FieldTrip
Component: core
Version: unspecified
Hardware: PC
Operating System: Windows
Importance: P1 normal
Assigned to: Jörn M. Horschig
Depends on:
See also:

Eelke Spaak - 2011-08-03 16:22:07 +0200

Executing this: >> cfg = []; cfg.method = 'template'; cfg.template = 'CTF275_neighb.mat'; = 'yes'; neighbours = ft_neighbourselection(cfg,data); results in this: Trying to load sensor neighbours from a template Successfully loaded neighbour structure from CTF275_neighb.mat there are on average 7.5 neighbours per channel Using the gradiometer configuration from the dataset. undoing the invcomp balancing Warning: the linear projection for the montage is not full-rank, the resulting data will have reduced dimensionality > In ft_apply_montage at 76 In ft-src/private/undobalancing at 29 In ft-src/private/channelposition at 31 In ft_neighbourplot at 82 In ft_neighbourselection at 199 undoing the comp balancing ??? Attempted to access proj(274,1); index out of bounds because size(proj)=[273,3]. Error in ==> ft_neighbourplot at 163 hs(i) = line(proj(i, 1), proj(i, 2), proj(i, 3), ... Error in ==> ft_neighbourselection at 199 ft_neighbourplot(cfg, data); 163 hs(i) = line(proj(i, 1), proj(i, 2), proj(i, 3), ...

Eelke Spaak - 2011-08-03 16:24:17 +0200

Also, I am a bit puzzled by ft_neighbourplot's behaviour. What is it doing with my gradiometer structure, if I explicitly use neighbours from a template?

Jörn M. Horschig - 2011-08-04 09:33:44 +0200

hey hey, the problem should be due to having a different amount of sensors in the neighbourhood structure than there are in the data. The template got 275 channels, while the neighbourhood structure of your data probably only got 273. I will work on that. To answer your other question: For plotting, the function needs information about the position of the sensors. In order to plot in 3D space, it reads from the grad to get the exact sensor positions.

Jörn M. Horschig - 2011-08-04 10:00:43 +0200

done, have fun ;) I also fixed a hole in the template around MLT26/MLT47