Data Tree Issue - Probably simple but I cannot get it

Hi,

I was wondering if anyone can tell me why what i am trying to do isn't working....

I am trying to connect the adjacent points within groups with a line.

I have generated the index numbers i need for each line as a tree branch. The groups themselves are a higher level tree branch each.

I am getting the correct number of lines but one between the correct points (duplicates instead) ie the mapping isn't working.

Can someone explain this/ give me rules of thumb to follow? I have tree issues often...

Thank you so much

Ken

Attachments:

Tree Problem.gh, 14 KB
TreeProblem.JPG, 150 KB

Replies to This Discussion

Permalink Reply by phillip on October 30, 2015 at 6:07am

Hi Ken,

not sure, but isn´t it this what you want to do? No tree mod necessary.

Best, p

Permalink Reply by Kenneth Allan on October 30, 2015 at 6:25am

Hi Phillip,

Yes this is effectively what I wanted to to but at that time I was testing that my mapping worked because I was going to do something with arcs later. My real issue is that I cannot understand why the mapping didnt work anyway. I sort of need an explanation on why it didnt take the groups path and only apply the list items that were generated for that list - like why group {1,0} doesnt only just run list items {1,0}{1,1}{1,2}{1,3} and not the lists {2,0}.....(2,4} you know.....?

But you make a good point I really should diversify the components I use since your solution moves me forward with the correct mapping maintained! Just curious about lists - its my Achilles heel.

Ken

Permalink Reply by phillip on October 30, 2015 at 7:27am

Well, its because you are matching your 7 branches of points {a} with 26 branches of indices {a;b}, which does not work the way you would like it, because auto-matching behaviour is relying on lists rather than on the tree...

Two ways to solve this, either shift down the higher structure and partition afterwards (which does not really work in your case) or duplicate the points to the tree structure of the indices. {a}-->{a;b}.

This can be done with some effort or my all-time-favourite-VB-tree-mod:

Private Sub RunScript(ByVal d As DataTree(Of System.Object), ByVal m As DataTree(Of System.Object), ByRef mD As Object)
    Dim dt As New datatree(Of Object)
    For j As Integer = 0 To m.BranchCount - 1
      For i As Integer = 0 To d.BranchCount - 1
        If m.Path(j).IsAncestor(d.Path(i), 0) Then
          dt.addrange(d.Branch(i).ToArray, m.Path(j))
          Exit For
        End If
      Next
    Next
    mD = dt
End Sub

Best, p