How do I separate branches from a tree?

Hi!

I would appreciate very much some advice, as this seems something really easy to do but I can't find a way.

I have a list which recognizes I have several branches: it goes (0;1), (0;2), (0;3)... etc. and (1;1), (1;2), (1;3)... etc. I need all the (0; ...) into one list and (1; ...) into another.

The thing is I can't use split nor dispatch because I need to be able to add new branches or more points and to separate the list according to the first number.

Thanks a lot!

Replies to This Discussion

Permalink Reply by Lasse Rahbek on March 29, 2015 at 10:05am

Can you upload the gh file

Permalink Reply by Lasse Rahbek on March 29, 2015 at 10:29am

This is my first shot at solving a problem in this forum and I am still pretty new to Grasshopper but i believe that you can solve it with the following configuration. Perhaps there are a more elegant solution out there

Permalink Reply by Valeria Ospital on March 29, 2015 at 2:06pm

thank you! that is a good start and it allows me to keep working

Permalink Reply by nikos tzar on March 29, 2015 at 12:38pm

http://www.grasshopper3d.com/forum/topics/retrieve-multiple-branche...

edit:

sorry, I just saw your last sentence. Can you explain what you mean by adding branches later on?

You might have branches like {3;n}, {4;n}, etc?... Is this limited (ex. they won't go above {5;n}) or not?

Permalink Reply by Valeria Ospital on March 29, 2015 at 2:07pm

Exactly. But it would be "unlimited"

Permalink Reply by nikos tzar on March 30, 2015 at 4:05am

In any case I believe the [ExplodeTree] component (using the zui feature to add outputs) should be helpful:

If you don't mind trimming (Pshift) your tree before, like Lasse suggested then things get less compicated

BUT,

you should keep in mind that as your tree structure changes, the outputs will also change and you would have to keep adding/removing outputs and changing wires.

It troubles me though, that you say you might have unlimited branches.. It doesn't really make sense, because if you want to split them, then it means that you want to take each one of them and do something different, so how will you pre-build your definition if you don't know the number of branches? If you don't mind sharing your definition and explaining why you want to split the tree, there might be a simpler and more efficient solution.

cheers, nikos

Permalink Reply by Valeria Ospital on March 31, 2015 at 6:17am

What I wanted was to set some relationships between {0;n} and {1;n} than then could be repeated when adding {2;n}, {3;n}, {4;n}... But I can keep working with Pshift for the model I need right now. So, thank you!

Attachments:

sant-ivo_hibridacion-proliferacion_06.gh, 160 KB

Permalink Reply by nikos tzar on March 31, 2015 at 7:16am

Ok, just as I thought, it is not a good idea to split your data tree at this point in your definition.

What will you do if you want to add more branches (another array of lines)?

Copy-paste this big part of the definition and start connecting wires again?... that's too much trouble and it, kind of, takes away the "parametric" from your design.

Instead, I suggest you take the time to study what data trees are and how they behave and try to work with them instead of exploding them to simple lists.

this is how you could produce all the lines you need with fewer components, without splitting your data and mainly without the need to grow your definition as the data changes:

Attachments: