Assuming that all numeric arrays are of a size that can be concatenated together:
>> cell2mat(cellfun(@cell2mat,a,'uni',0))
ans =
2 1 1
2 1 -1
You can then use reshape to arrange the data into a 3D array. Or alternatively, use reshape or permute on the intermediate cell array:
cell2mat(permute(cellfun(@cell2mat,a,'uni',0),[1,3,2]))
As you did not state how you want the dimensions rearranged, it is hard to give more advice than that.
