Hi Sarah,
I had noticed that problem a while ago, but forgot about it.
The problem is the way 3dclust was written to create a new
dataset. It does not work when the input is specified using
the '[sub-brick]' format.
So until we actually fix that problem, you'll have to avoid
the sub-brick syntax for this particular case. i.e. try
3dbucket -prefix nwhere_2_9 nwhere1_2+orig'[9]'
3dclust -prefix clust_where1_9 -1noneg -1clip 50 5 400 nwhere1_2_9+orig
Sorry,
- rick