not able to cull by number equivalence...help!

Hi everyone,

I have a culling problem I hope someone can help me solve.

I have tried using both Grasshopper component as well as Python script, but the same problem persists.

I have a set a numbers that I hope to Cull out from a list of Distances of Closest Points (so that each point will ignore what belongs to its own body). As you see below, the points are 0.0 ~ 327.76884. I use a simple Python script which should do the job, but as output of a = Dist, the numbers starting with 163 and 189 appear un-erased.

I had wondered if it would be a matter tree structure, but trying flattening and grafting didn't change anything.

If someone has any ideas, please help me out, thank you!!

Attachments:

cullQ.gh, 9 KB

Replies to This Discussion

Permalink Reply by Vongsawat Wongkijjalerd on April 24, 2017 at 3:12am

Something like that?

Your problem would be clearer with an attach gh tbh.

Permalink Reply by Ying Xu on April 24, 2017 at 3:41am

Hi Vongsawat,

Thank you for your response and sorry for being unclear, I have revised my question and uploaded the file. It's that I needed to compare the Set of numbers against a larger list of Distances which include the same numbers as well as other numbers, then remove the points with those distances. Some, such as the 0.0, was removed, but others such as the 163 remain...... Thanks in advance for your further input!~

Permalink Reply by Matt Gaydon on April 24, 2017 at 4:21am

You can use Set Difference component. (Set> Sets> Set Difference).

Also no need to sort you list of numbers your looking for. Don't know how you made the set to search for but have a look at Cset for extracting only unique numbers from a list.

Attachments:

cullQ_MG_edit.gh, 8 KB

Permalink Reply by Ying Xu on April 24, 2017 at 5:13am

Thank you Matt for your solution, it simplifies my problem by miles.

I needed the tree structure to be retained and have the culled items as nulls.

So along your line of thought, I used Set Intersection to achieve it =) and it works great, thank you!

Attachments:

cullQ_MG_edit_add.gh, 11 KB

Permalink Reply by Mateusz Zwierzycki on April 24, 2017 at 4:52am

http://www.grasshopper3d.com/forum/topics/floating-point-error-why-...

Permalink Reply by Ying Xu on April 24, 2017 at 5:23am

Thank you Mateusz for your direction, I understand the underlying problem of the occurrence now. However, when I try to eliminate the problem by rounding all the floats with an Interger component (assuming it gets rids of the problem....) it doesn't get rid of the problem. It seems like for this post here Integer does solve the problem, however....