if you create your contrasts using the spm batch facility then it is easy to
re-create them when you need to add or change a contrast. I have found this
to be handy, particularly for larger designs.
cheers
russ
Darren Gitelman wrote:
> I've got a very simple answer. you can't.
>
> hope this helps,
>
> darren
>
> p.s. the more complex answer is that that to delete contrasts you'd
> have to do several things which make the process onerous.
>
> 1) reorganize the structures in xCon so as not to leave any gaps. So
> if you have 4 contrasts and delete contrast 3, you'd have to move the
> 4th one into the 3rd slot.
>
> 2) Delete the associated disk files con*.img and spmT*.img and their
> *.hdr files from the disk.
>
> 3) rename the remaining con and spmT files to now correspond to the
> contrast structure that you've created. So if you've moved contrast 4
> into the 3rd slot you have to rename these as con_0003.img. Now this
> is not actually necessary because the references to those files are
> still correct in the xCon structure but you'd be faced with the
> situation of having contrast 3 in the contrast manager linked to
> con_0004.img files on disk.
>
> I'm sure there's more to do, but overall it's not a pretty story. The
> only contrast that's reasonably easy to delete is the last one
> entered for obvious reasons.
>
> The best choice perhaps is to rename your contrast. You you can do in
> the contrast manager either by right clicking on the frame or by left
> clicking with the control button pressed depending on your system.
> You could then name it to "Do not use this contrast" and then ignore
> it.
>
> drg
>
> >Dear all,
> >
> >I've got a very simple question.
> >
> >How can I delete already defined contrasts?
> >
> >Thank you for your help,
> >
> >Evi
--
Russell A. Poldrack, Ph. D.
MGH-NMR Center
Building 149, 13th St.
Charlestown, MA 02129
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Web Page: http://www.nmr.mgh.harvard.edu/~poldrack
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