Index (item index) not working the way I would guess it to...

Hi,

I would like to get some particular values form a list in this simplified example number 48. I tried to do so using the Index component, but it doesn´t "understand me"... (It return value of -1, as if there were no "matches" - that´s how it works, says the help menu) What do I do wrong?

Thank for your answers...

Šimon

Attachments:

Item index.jpg, 40 KB
Index.gh, 3 KB

Replies to This Discussion

Permalink Reply by Danny Boyes on November 24, 2011 at 6:37am

Read this thread for an explanation of what index item does: http://www.grasshopper3d.com/forum/topics/list-index

The Component you should be using is [Find Similar Member] in the Sets Tab > Sets Panel

Permalink Reply by David Rutten on November 24, 2011 at 9:38am

To put it as succinctly as possible, [List Index] compares memory-addresses whereas [Find Similar Member] compares the actual data regardless of where it's stored in memory.

[List Index] is fairly obscure but may be useful if you need to figure out which items out of an original list you're left with.

The benefit of [List Index] over [Find Similar Member] is that it does not get confused when there are multiple items in a list that have the same value, but not the same memory location and that it works on all data types. [Find Similar Member] only works on data for which I have a good comparison algorithm (numbers, text, points etc, not breps and meshes).

David Rutten

david@mcneel.com

Poprad, Slovakia

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