[FieldTrip] Plot classifier weights' topography

[Barnett, Benjy]

Hi!

I am trying to plot the topography of my LDA weights, but am having some trouble. I am using my own script to calculate the weights rather than any packages (e.g. DMLT, or MVPA-light), so the tutorials on the fieldtrip site haven’t been able to help me. So far, I’ve simply tried adding the weights (a 306x1 length vector) as a field to my data structure. And trying this code:


data.weights = weights;
cfg = [];
cfg.xlim ='maxmin';
cfg.zlim = 'maxmin';
cfg.layout = 'neuromag306all.lay';
cfg.channel = 'MEG';
cfg.parameter = 'weights';
figure; ft_topoplotER(cfg,data); colorbar



Unsurprisingly, this doesn’t work. It results in the error 'field “weights" not present in data’. I assume because the weights field is not interpretable by the fieldtrip code. I guessed the lack of a dimord field for the weights might be underlying its lack of interpretability, but playing around with that has not worked either. I’ve tried adding a ‘weightsdimord’ field with the [306x1] dimensions, but this also - unsurprisingly - didn’t work.

Is there a way around this? Will I need to use lower level functions than ft_topoplotER? If so, can anyone advise on how I might implement this?

Many thanks for your time,
Benjy
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