[Taxacom] Partitioned Bremer with TreeRot

[llarkin at unm.edu]

I am trying to calculate partitioned Bremer scores using TreeRot, and 
I am getting non-standard output for some datasets.  Instead of the 
standard output (tree length in left column, bremer score in right 
column), my output looks like this:

    110       	     NAN(004)
    236       	   236
1 sec (CPU time = 0.11 sec)
      NAN(004)	     NAN(004)

The output isn't complete nonsense, as the numbers in the left column 
(110 and 236 above) are the number of steps each partition 
contributes to that constraint tree, so I can theoretically still 
calculate the Bremer scores.  This only seems to happen with smaller 
datasets (around 25-30 taxa or fewer).

Has anyone experienced this?  Do you have any suggestions as to what 
might be going on?

Thanks in advance.

-- 
Leah Larkin, Ph.D.
Research Assistant Professor
Department of Biology
MSC03 2020, 167 Castetter Hall
1 University of New Mexico
Albuquerque, NM 87131-0001
(505) 277-2388 (Lab)	(505) 239-6036 (Cell)
(505) 277-4225 (Museum)	(505) 277-0304 (FAX)