Yune,
it is the pre-whitenen matrix which is used for the non-sphericity
corretion and the autocorrelation model (AR(1)) at the 1st level. It is
saved as a sparse matrix in the SPM struct, hence the unusual output, when
you call it on the command prompt. To get the full matrix type: full(SPM.xX.W)
Cheers,
Jan
Yune Lee wrote:
>
> Dear SPM and matlab experts,
> Could anybody explain me what the SPM.xX.W is for?
> If I load SPM.mat and type it, I get the values like below, but I'm not
> sure what it really means.
> Let me know. Thanks.
>
> - YSL
>
> ans=
> .
> .
> .
>
> (889,884) -0.0003
> (890,884) 0.0004
> (891,884) -0.0002
> (892,884) 0.0000
> (893,884) -0.0000
> (876,885) -0.0000
> (877,885) 0.0000
> (878,885) -0.0002
> (879,885) 0.0004
> (880,885) -0.0003
> (881,885) 0.0002
> (882,885) -0.0010
> (883,885) 0.0124
> (884,885) -0.2216
> (885,885) 0.9270
> (886,885) -0.2216
> (887,885) 0.0124
> (888,885) -0.0010
> (889,885) 0.0002
> (890,885) -0.0003
> (891,885) 0.0004
> (892,885) -0.0002
> (893,885) 0.0000
> (894,885) -0.0000
--
Jan Gläscher, Ph.D. Div. Humanities & Social Sciences
+1 (626) 395-3898 (office) Caltech, Broad Center, M/C 114-96
+1 (626) 395-2000 (fax) 1200 E. California Blvd
[log in to unmask] Pasadena, CA 91125
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