I am trying to sort a second list, using the unique keys from the first list but am having trouble with the “List.GroupByKey” node, is there a better way for me to do this or are there other nodes that i should be using? Any help would be greatly appreciated, Thanks [GroupByKey%20help]

Could you explain a bit more what you are trying to achieve here? You are also providing an unequal number of keys (51) and values (53) which is causing the List.GroupByKey node to not work.

I am trying to measure the distance between spaces within the same family. The logic I am trying to accomplish right now is, if the value of the primary parameter equals the value in the comments parameter, dynamo will get the location of those 2 spaces then draw and measure a line, to return the d…

I’ve managed to sort out 2 list, is there a way to compare and format the 2 so that the lists are pointing to the right index on each other? For example index 0 on the bottom list is “Department block - Marketing”, However “Department block - Marketing” is index 12 on the top list, can I make it so…

I’m still having difficulty understanding your end goal, but maybe this will help: [image] Group By Key.dyn (18.1 KB)

I’ve gotten closer but not quite there yet, how do I rearrange it so that the “==” node is all true, I have the lists that I want, but the index’s are not in the correct order, I have tried sorting the keys before the “List.GroupByKey” node but breaks the node. [GroupByKey%20help]

I think it’s because you’re filtering your Comments groups but not your Primary groups. Your lists don’t match.

[image] hle: if the value of the primary parameter equals the value in the comments parameter, dynamo will get the location of those 2 spaces then draw and measure a line If the Primary and the Comments match then wouldn’t they be the same room and therefore be a point and not a line?

Thanks for all the responses, I got the script to work! it just required me to flatten and sort the 2 lists again using “List.SortByKey” [GroupByKey%20help]

Hi @Nick_Boyts , I have another similar requirement. I want to Group hangers with “Total Strut Length” (1st grouping). Based on the total strut length grouping, I want to group hangers with “Rod Length 1” (2nd grouping). Based 2nd grouping, again I want to group hangers with “Rod Length 2” (3rd group…

Have you searched for similar questions across the forum? Sorting/grouping by multiple values gets covered pretty often. There’s no difference in how you handle more groups. It’s just list management. Also, please show us what you’ve tried so far so we can give feedback.

Sorting with List.GroupByKey

Nick_Boyts June 19, 2019, 8:33pm 10

If you want both lists to be in the same order then just Sort first and then Group like you did in the second part. I don’t think there’s any reason to group the first time.

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Sorting with List.GroupByKey

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