3D vector for TTree::Scan and Draw

[kormoranos]

Hello,

I am facing the same problem described in this post, i.e. using 3D vector from TTree:

3D vector seems to be not working with TTree

Hello, This is inspired by PyROOT and 3D vector, but I might have discovered a more general problem(s) with ROOT TTrees, or I am doing something wrong. It seems that 3D vectors (tested with floats and doubles) is not properly stored in a TTree: gInterpreter->GenerateDictionary("vector<vector<vector<Float_t>>>", "vector"); vector<vector<vector<Float_t>>> a; vector<vector<Float_t>> b; vector<Float_t> c; c.push_back(1.); c.push_back(2.); c.push_back(3.); b.push_back(c); c.clear(); c.push_back(…

I would like to use Scan and Draw interactively but all fields are zero.

Is there any solution or workaround for this?

ROOT Version: 6.26/10

Thanks!

[Danilo]

Hi,

apologies things seem not to work out of the box for you.
Could you post a reproducer of the issue?

Cheers,
D

[kormoranos]

Thank you for the reply, Danilo.

Actually, if I try with the code attached by the user in the old post (I attach it here for simplicity), I can observe exactly the same problem:

root [2] t->Scan()
***********************************
*    Row   * Instance *         v *
***********************************
*        0 *        0 *         0 *
*        0 *        1 *           *
***********************************

Do you think it is enough?

Example.C (488 Bytes)

[ferhue]

Potentially related:
https://its.cern.ch/jira/browse/ROOT-4302
https://its.cern.ch/jira/browse/ROOT-7757
https://its.cern.ch/jira/browse/ROOT-8726
https://its.cern.ch/jira/browse/ROOT-7622
https://its.cern.ch/jira/browse/ROOT-7348
https://its.cern.ch/jira/browse/ROOT-7465

A "3D" vector - vector<vector<vector<>>> - mistreated by TTree Scan and TBrowser

[kormoranos]

Thank you for more information.

Do you mean that the problem is still there and there is no possible workaround at the moment?