Not working List.setdifference

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Hi experts,

I was trying to use the List.setdifference node but it doest not work for me. Can you guide me where am I going wrong.

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If you showed the node previews it would help us understand what you’re dealing with and would likely show you where the problem lies. Alignments already returns a list. By “creating” a new list for that information, you’re really just adding another list dimension. Now your inputs are the wrong structure and the node thinks you’re looking for a list of lists. Creating a list for the selected alignment is correct, because the selection is a single object but SetDifference requires a list input.

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here are the previews. What I am trying to do is remove the selected alignment in the list. basically I want to delete all alignments except the one that is selected.

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Remove the List.Create between Alignments and List.SetDifference, it is possible you are comparing a list to the selected alignment

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what will be the better approach? i wanted to delete all alignments except the one selected. can you guide on what nodes to be use. Thanks a lot for your time.

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Hi, here’s a way to work with floating points.

rep 250417
rep 2504172146Ă—1320 196 KB

Sincerely,
Christian.stan

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Try this:

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Notice above you have a list of lists of alignments (@L3), while below you a list of one alignment (@L2).

If that doesn’t work it’s because of what you’re comparing, not the real object but a reference to it built in Dynamo two separate ways. Comparing handles and using a List.FilterByBoolMask will do the trick if that is the case.

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Hi I am a beginner, can you enlighten more about comparing handles and List.FilterByBoolMask. I have tried your suggestion and still it does not work.

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This will do the trick and should work for all supported Civil 3D builds without any dependency on a 3rd party package or a node with breaking changes:

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image1920Ă—1080 144 KB

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hi Jacob that works great! thank you so much. now one more thing how do I go about deleting the filtered alignment? the Object.Delete node will not work after the List.FilterByBooleanMask results.
I am guessing we need for convert back the Handles into alignments.

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Hi, you need to feed your objects (List Before Python 1, you must keep python1) , not your strings, into the List.FilterByBoolMask.

Sincerely,
Christian.stan

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oh my!.. now i understand. Thanks a lot!

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