Item Index - after move does not work

What I want to achieve is from a list of points, check if the point next to it is there, and then generate a 0 of a 1 for presence or not presence. I want to do this with all 8 dots surrounding it (its a wall, of 1 layer of dots). By 'moving' the dots along a vector I can displace the dots to the position where an other dot could be.

By using index-list on the original list, and as items using the displaced list I thought I could check if the displaced dot is also present in the orignal list. This does not work. If I simply jitter the list I can still find all the value's indexes. But if I move the dots along a axis, the index-list gives all -1 (value not present) somehow.

Any help and/or insights about this issue are very much appreciated.

I added the original script, zoomed to the function I'm talking about, and a screenshot of the function.

Attachments:

error_index-list.jpg, 580 KB
new_reduce_v21.gh, 95 KB

Replies to This Discussion

Permalink Reply by AMA on January 8, 2012 at 7:36am

In further research I can add, that it seems that the item index works with the list, if i subtract a item and then uses it's value to find it with item index, it works, if I jitter the list it works, but as soon as u use 'new' data, an integer, an panel, an move/transform numbers, it ALWAYS returns -1, instead of as i expected it to do, if the given value is present in a list, return its index number.

Permalink Reply by David Rutten on January 8, 2012 at 8:45am

You need to use the [Member Index] component, it does what you need. You can search the forum for other topics regarding List Index, it's been talked about before. Basically, it doesn't work the way you, and pretty much everyone else :) thinks it works.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by AMA on January 8, 2012 at 9:20am

Thank you so much this exactly what i mean!

ANd very sorry, I did try to search the forum apperantly wrong.

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