[image] I’m new to Grasshopper. Is there a way to select all the topmost points? I’m trying an approach where for each pair of x and y, I take the maximum z value, but at this step, I don’t know how to filter branches where row 0 and row 1 have the same values and then pick the one from row 3 with…

This might answer your question: [image] Set Member Index Example (MIndex) This involves use of the 'Member Index (MIndex)' component from the 'Sets' tab. I've seen this done before but couldn't remember how it worked, couldn't figure… [MIndex_2017Jan22a] R…

For each unique XY, the white point is the highest (in Z): [MIndex_2017Jan22aa] MIndex_2017Jan22aa.gh (19.1 KB)

Oh, I thought there might be something to it that I missed.

[image] Volker Rakow: Oh, I thought there might be something to it that I missed. I learned it ~8.5 years ago when I created that thread on the old forum , from code that is now ~12.5 years old: [image] counting duplicate numbers in a list Hello, I thought I had seen this come up …

Select points with highest Z value per (X, Y) coordinate

Grasshopper

Volker_Rakow (Volker Rakow) May 31, 2025, 10:27pm 5

Is there a reason why you created the selection indices from the set map instead of from the collection directly?

MIndex_vr1.gh (42.8 KB)

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Select points with highest Z value per (X, Y) coordinate

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