Eric, I just realized that also you can just add ".all" to your property, and it will guarantee an array:
$ load =1utb # one water oxygen is marked altloc A $ print {altloc!=''}.altloc.ALL.sort A $ print {altloc!=''}.altloc.all.pivot { "A" : 1 } This is consistent with how .all is used to get an array of values, not just an average, for numerical data. I will get that into the documentation. Bob -- Robert M. Hanson Larson-Anderson Professor of Chemistry Chair, Department of Chemistry St. Olaf College Northfield, MN http://www.stolaf.edu/people/hansonr If nature does not answer first what we want, it is better to take what answer we get. -- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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