> in the realignment stage we get the error that there is not enough
> overlap in the images to find a solution. So we tried to look at the
> images with "display" and "check reg". In check reg, a single black
> box with no crosshairs appears in the display box and the error message
> "matrix is singular to working precision" is given. In "display", again
> a single image with no crosshairs - and the following error:
>
> "error using chol-> matrix must be positive definite".
>
> Our images are in .img format and are visualisable without problems
> in analyze.
Maybe this is a header byte swapping problem. Have a look at
http://www.mailbase.ac.uk/lists/spm/2000-10/0056.html
Cheers,
Matthew
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