ROOT Version: 6.18
Platform: lxplus
Compiler: Not Provided
Hi,
I am wondering if there is a way to fill the tree object by object instead of event by event in RDataFrame.
For example, in “normal” ROOT, we used to fill in object loop before as follows:
for(int i = 0 ; i < jets.size(); i++){
…
tree.fill();
}
I am making a combination with RDataFrame.
Thank you very much for any help.
Regards,
Jieun
Hi,
please check this post about posting code.
You can Define, event by event, a column that is a vector of objects. Would that work?
Cheers,
Enrico
I mean, I already got the objects as a vector with Define and filled the tree using Snapshot event by event as a vector of objects.
If I print out the tree with Snaphot, I got this:
root [2] tree->Scan()
***********************************************
* Row * Instance * signal * mbb *
***********************************************
* 0 * 0 * 0 * 283.59848 *
* 0 * 1 * 1 * 184.48533 *
* 0 * 2 * 0 * 181.59184 *
* 1 * 0 * 0 * 421.54138 *
* 1 * 1 * 0 * 469.25665 *
* 1 * 2 * 0 * 91.167800 *
* 2 * 0 * 0 * 83.889991 *
In this case, Row is the event.
But I would like to fill the tree object by object like this:
root [2] tree->Scan()
************************************************
* Row * signal * event * nbjets *
************************************************
* 0 * 0 * 409 * 4 *
* 1 * 0 * 409 * 4 *
* 2 * 1 * 409 * 4 *
* 3 * 0 * 409 * 4 *
* 4 * 0 * 409 * 4 *
* 5 * 0 * 409 * 4 *
* 6 * 0 * 564 * 3 *
* 7 * 0 * 564 * 3 *
* 8 * 1 * 564 * 3 *
* 9 * 0 * 646 * 3 *
* 10 * 0 * 646 * 3 *
* 11 * 0 * 646 * 3 *
* 12 * 0 * 890 * 3 *
Here, Row is the combination.
Do you have any good ideas?
Thank you very much,
Regards,
Jieun
Ah I see, that would require this feature, that has been proposed a few times and allows processing vector elements one after another disregarding event boundaries.
In the meantime, I think something like that is better done with the classic TTree interfaces.
Cheers,
Enrico