feature map and dpabi

Submitted by Ali on

Dear Dr YAN

i use this code for map the discriminant feature to the brain:

%wcoeff:is the eigenvectors of pca(271633*139)
%w: is the absolute features weight(1*68)
%68:no of discriminant features
load('wcoeff');
load('w');
w=abs(w);
smatrix=zeros(61,73,61); 
v=wcoeff(:,1:68)*w';
new_matrix = reshape(v, 73,61, 61);
out.vol = new_matrix;
% write to a nifti file
err = MRIwrite(out,'new_matrix.nii','double');
 
My result was:
 
after i moved the cursor the result was:
My question:why the volume its size is very very small?
your help is appreciated.
Forums
DPABI/DPABISurf/DPARSF