Hi
Im trying to group a list of points by their Z coordinates but after they are grouped there are points which have the same z coordinates are grouped into two groups. Im not sure if it’s some kind of bug or if Im doing something wrong.
You could try to use a Flatten node or manipulate the List@Level, see on this page:
http://dynamoprimer.com/en/06_Designing-with-Lists/6-3_lists-of-lists.html
There may be slight variances in the Z values that Dynamo is rounding? Just a guess.
Try getting the Z value and rounding it before using List.GroupByKey.
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My guess is that they are slightly off.
List.GroupByKey instead, getting the points Z values and round them to the 3rd decimal digit with the Math.Round node.
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Nick you are like 30 seconds ahead of me today. 
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If ya aint first, yer last!
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Hehe,
yeah. it worked! Thanks!