Problems with gmdistribution.fit

Hi all,

I'm trying to do clustering with gm. I tried this code:

opts = statset('MaxIter', 300, 'Display', 'iter');

%Init Randomly
gm = gmdistribution.fit(braindata, nsegments, 'Regularize', 1e-6, 'Options', opts);

where braindata is a data matrix(voxel*protein, 1478071*11) and nsegments is 8.

And I got this error:

Error using gmdistribution.fit (line 136)
The following column(s) of data are effectively constant: 6   7   8   9  10  11.

Error in reducedSegbrain_gmix (line 119)
gm = gmdistribution.fit(braindata, nsegments, 'Regularize', 1e-6, 'Options', opts);

Is there any workaround to this?

Thanks.