I have a list attribute such this one:
p'a', 'b', 'c', 'a', 'b']
I would like to have the number of different values present in that list.
In python I would do:
list=h'a', 'b', 'c', 'a', 'b'] len(set(list)) >>> 3
Alternatively, if you don't want to modify the original list, use the ListHistogrammer instead and then count the number of elements of the resulting "_histogram" list with the ListElementCounter.
I think your Python solution is elegant and efficient.
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# Script Example for PythonCaller
def countUniqueElements(feature):
feature.setAttribute('_count', len(set(feature.getAttribute('_list{}'))))
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Takashi