splitting data lists

Returning to GH after a long time... I seem to be getting rusty!

I have a data tree which looks something like this:

{0;0} (2)

{0;1} (2)

{0;2} (2)

{0;3} (6)

{0;4} (6)

{0;5} (5)

{0;6} (5)

{0;7} (8)

I would like to group the paths based on their item count (n) values resulting in a tree which should look something like this:

{0;0} (3)

{0;1} (2)

{0;2} (2)

{0;3} (1)

in other words, all paths with 2 items are under one path, all with 6 items in another, and so on.

I feel that the pathmapper should be able to do this very easily but cannot figure out what the expression should be... I have tried searching the forum but have not had much luck!

Any ideas? Thanks a ton!

Replies to This Discussion

Permalink Reply by David Rutten on April 25, 2010 at 4:54pm

I don't think you can use a Path Mapper for this directly. You want to structure one tree based on information in another. If you want to use PathMapper then you'll somehow have to merge these two trees, operate on the combined set and then peel them apart again...

This is tricky. I'd even go as far as tricky.

See attached.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Attachments:

MyHeadJustExploded.ghx, 75 KB

Permalink Reply by taz on April 25, 2010 at 6:26pm

Whoa... Trees sublisted within trees... My brain just shut down as a survival mechanism.

Speaking of non-standard practices, can you comment on "the mix" originating from within the below discussion?

http://www.grasshopper3d.com/forum/topics/sos-how-to-compare-the?co...

Much obliged, sir.

Permalink Reply by David Rutten on April 26, 2010 at 4:04am

What part of it needs comment?

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by Sameer Kumar on April 25, 2010 at 8:01pm

:)
I had a funny feeling that maybe what I was trying was too complicated... thank you for confirming it. This surely is not a path I want to follow. I will look for alternatives.

Permalink Reply by David Stasiuk on April 26, 2010 at 4:19am

That is tricky. It'll take me a while to wrap my head around this one.

I have never seen "item_count" before...it's excellent. Is there any place that has all of the syntax of path mapper all together?

Permalink Reply by David Rutten on April 26, 2010 at 6:13am

Path Mapper help topic (double click the PathMapper icon in the toolbar but also accessible from any PathMapper menu).

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by David Reeves on July 26, 2010 at 8:54pm

I stumbled onto this discussion and thought I'd take a crack at it. heres an alternative solution that culls the set of paths according to each path's respective length.

Attachments: