[ROOT] PROOF: TTree->SetAlias() and TTree->Draw()

[Thiemo Nagel]

Hello,

somehow I can't get TTree->Draw() to work with aliases with PROOF, maybe
somebody could be so kind to help me out.

I'm using ROOT v5.22. When executing t->Draw() using an alias, I'm
getting the following error message (see [6] below):

TProofDrawHist::CompileVariables: Error compiling variables

Whereas everything works as expected without the alias [7].

The full transcript of the session is below.

Thanks a lot, kind regards,

Thiemo Nagel


nailgun:/tmp> root
Executing rootlogon.C done.
root [0] TProof *proof = TProof::Open("localhost");
Starting master: opening connection ...
Starting master: OK
Opening connections to workers: OK (4 workers)
Setting up worker servers: OK (4 workers)
PROOF set to parallel mode (4 workers)
root [1] TChain *t = new TChain("NEUTRAL");
root [2] t->Add("/......root");
root [3] t->Add("/......root");
root [4] t->SetAlias("p", "V");
root [5] t->SetProof();
root [6] t->Draw("p.type");
Looking up for exact location of files: OK (2 files)
Looking up for exact location of files: OK (2 files)
Validating files: OK (2 files)
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1
Error in <TCanvas::Range>: illegal world coordinates range: x1=0.000000,
y1=-0.131250, x2=0.000000, y2=1.181250
Error in <TCanvas::RangeAxis>: illegal axis coordinates range:
xmin=0.000000, ymin=0.000000, xmax=0.000000, ymax=1.050000
Mst-0: grand total: sent 3 objects, size: 17709 bytes
OBJ: TStatus PROOF_Status ERROR
TProofDrawHist::CompileVariables: Error compiling variables
Error in <TCanvas::Range>: illegal world coordinates range: x1=0.000000,
y1=-0.131250, x2=0.000000, y2=1.181250
Error in <TCanvas::RangeAxis>: illegal axis coordinates range:
xmin=0.000000, ymin=0.000000, xmax=0.000000, ymax=1.050000
root [7] t->Draw("V.type");
Looking up for exact location of files: OK (2 files)
Looking up for exact location of files: OK (2 files)
Validating files: OK (2 files)

Mst-0: grand total: sent 3 objects, size: 1641 bytes

[Philippe Canal]

Hi Thiemo,

Indeed, the list of Alias put on the TChain is not yet passed onto the
slave (where it should be merged with
the list of alias of the TTree); this will be fixed in a future release.

Cheers,
Philippe.

Post by Thiemo Nagel
Hello,
somehow I can't get TTree->Draw() to work with aliases with PROOF, maybe
somebody could be so kind to help me out.
I'm using ROOT v5.22. When executing t->Draw() using an alias, I'm
TProofDrawHist::CompileVariables: Error compiling variables
Whereas everything works as expected without the alias [7].
The full transcript of the session is below.
Thanks a lot, kind regards,
Thiemo Nagel
nailgun:/tmp> root
Executing rootlogon.C done.
root [0] TProof *proof = TProof::Open("localhost");
Starting master: opening connection ...
Starting master: OK
Opening connections to workers: OK (4 workers)
Setting up worker servers: OK (4 workers)
PROOF set to parallel mode (4 workers)
root [1] TChain *t = new TChain("NEUTRAL");
root [2] t->Add("/......root");
root [3] t->Add("/......root");
root [4] t->SetAlias("p", "V");
root [5] t->SetProof();
root [6] t->Draw("p.type");
Looking up for exact location of files: OK (2 files)
Looking up for exact location of files: OK (2 files)
Validating files: OK (2 files)
<TCanvas::MakeDefCanvas>: created default TCanvas with name c1
Error in <TCanvas::Range>: illegal world coordinates range: x1=0.000000,
y1=-0.131250, x2=0.000000, y2=1.181250
xmin=0.000000, ymin=0.000000, xmax=0.000000, ymax=1.050000
Mst-0: grand total: sent 3 objects, size: 17709 bytes
OBJ: TStatus PROOF_Status ERROR
TProofDrawHist::CompileVariables: Error compiling variables
Error in <TCanvas::Range>: illegal world coordinates range: x1=0.000000,
y1=-0.131250, x2=0.000000, y2=1.181250
xmin=0.000000, ymin=0.000000, xmax=0.000000, ymax=1.050000
root [7] t->Draw("V.type");
Looking up for exact location of files: OK (2 files)
Looking up for exact location of files: OK (2 files)
Validating files: OK (2 files)
Mst-0: grand total: sent 3 objects, size: 1641 bytes