How to remove selected objects from a point grid?

[Gemikli_Artur]

Hello everyone!

I am searching for a solution to remove the yellow marked columns from the grid which I formed by point arrays, so that all other ones stay at their places unchanged.

Does anybody know a way how to solve this is as easy as possible? I have attached the entire script as well for reference.
Thank you!

Grasshopper Script.gh (25.9 KB)

[GHwiz]

use a list item to find out the index of those two columns, then cull those two indexes from your data

[Gemikli_Artur]

I have tried it out, but culling the indexes doesn’t work out. Do you know what I’m doing wrong here?

[GHwiz]

Why your culling didn’t work

In your screenshot, you’re doing this:

1. Find two items with List Item

2. Get their indices

3. Use those indices in Cull Index

But here’s the Grasshopper trap:

List Item does not give you the indices — it only extracts the values.

You are still missing the actual index numbers to feed into Cull Index.

Grasshopper does not automatically back-solve “where in the list did this value come from?”

That’s why Cull Index is doing nothing — it’s receiving invalid or empty index values.

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How to correctly remove two items by value

To remove the columns you found:

Method 1 — Use Member Index (the correct way)

If you already know the values you want to remove:

1. Take the outputs of your List Item (the two column vectors)

2. Plug them into Member Index

   • This returns the correct indices

3. Merge the two indices

4. Plug that into Cull Index

[GHwiz]

there is also an alternative method, finding the member index, and then dispatching your list into true/false that separates the wanted columns from the unwanted ones

with member index and dispatch

[leopoldomonzani]