Hi, SPM experts
I'm using SPM5 and getting confused about the result of spm_Ce.m
In my case, I ran the following code.
&& =============================================
a = spm_Ce([160,160], 0.2);
full(a{1,1})
& only show the first 7x7 submatrix
1 0.20000 0.04000 0.00800 0.00160 0.00032 0
0.20000 1 0.20000 0.04000 0.00800 0.00160 0.00032
0.04000 0.20000 1 0.20000 0.04000 0.00800 0.00160
0.00800 0.04000 0.20000 1 0.20000 0.04000 0.00800
0.00160 0.00800 0.04000 0.20000 1 0.20000 0.04000
0.00032 0.00160 0.00800 0.04000 0.20000 1 0.20000
0 0.00032 0.00160 0.00800 0.04000 0.20000 1
&& =============================================
However, this result is different to my 1st level GLM analysis saved in SPM.xVi.Vi
full(SPM.xVi.Vi{1,1})
& only show the first 7x7 submatrix
1 0.19611 0.03919 0.00783 0.00156 0.00031 0
0.19611 1 0.19984 0.03996 0.00799 0.00159 0.00030
0.03919 0.19984 1 0.19999 0.03999 0.00799 0.00159
0.00783 0.03996 0.19999 1 0.19999 0.03999 0.00799
0.00156 0.00799 0.03999 0.19999 1 0.19999 0.03999
0.00031 0.00159 0.00799 0.03999 0.19999 1 0.19999
0 0.00030 0.00159 0.00799 0.03999 0.19999 1
&& =============================================
I thought these two result should be identical. Is there any reason cause this difference ?
Thanks in advance.
Philip Lin.
|