Help with dipole fitting
Ludwing Torres
lumatobu2 at HOTMAIL.COM
Sun Jul 25 03:38:08 CEST 2010
Hi Paul, I don't know if you have heard or worked with eeglab, here they use a dipole fitting without considering the time course in the dipole moments, ¿Can I somehow use the functions of fieldtrip in eeglab to perform dipole fitting and consider the time course in eeglab too?
Another question: when I perform the example below:
http://fieldtrip.fcdonders.nl/example/compute_forward_simulated_data_and_apply_a_dipole_fit
And I compute the dipole fit with the first simulated dataset, I get the next structure:
dip1 =
label: {1x128 cell}
dip: [1x1 struct]
Vdata: [128x250 double]
Vmodel: [128x250 double]
time: [1x250 double]
dimord: 'chan_time'
cfg: [1x1 struct]
And, after define the dipole moment as [1 0 0]' , I go to the dip field and in the field mom (i.e. dip1.dip.mom) I get an 3x250 double matrix.
So, when I define the dipole position it is [0 0.5 0.3] and in the dipole fit in the field dip1.dip.pos, I get this same position (aproximated) it is [-2.1186e-008 0.5000 0.3000], but in the dipole moment I don't get the same, not even aproximated, instead of [1 0 0]', I get this [3x250 double] matrix. ¿Am I commiting any mistake or is a concept error? and ¿ How we can interpret this when we have more than two dipoles?
Thank you for your help.
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