Re: [ROOT] TSQLServer & TMySQLServer

Hi Rene!

Yes, I understand that TSQLServer is a base class to TMySQLServer, 
TOracle... etc., but it's not an abstract base class, despite the fact 
that in http://root.cern.ch/root/html/TSQLServer.html it says so.
So I have two choices to connect to a MySQL server: TSQLServer or 
TMySQLServer (we tested both, either worked).

Therefore I was wondering
 >> ..., if one (e.g. TMySQLServer) is preferred above the
 >> other (TSQLServer), e.g. for performance reasons or if they are
 >> completely equivalent to use.

They seemed equivalent when testing, but I was wondering about subtle or 
not so subtle differences?!

Thanks and cheers, Bernd.

Rene Brun wrote:
>  Bernd,
> 
> Note that TMySQLServer is just an incarnation of TSQLServer base class, 
> like we have TOracleServer, etc.
> 
> Rene
> 
> On 30/09/2010 17:15, Bernd Reinhold wrote:
>> Dear ROOTers!
>>
>> With ROOT comes a class TSQLServer, TSQLResult, TSQLRow but there are 

Re: [ROOT] TSQLServer & TMySQLServer

Hi Bernd,

    TSQLServer is not a pure abstract class but it acts as one. We advice 
to create an actual instance of a TSQLServer dreived class by using:

TSQLServer::Connect()

where the url passed to connect makes sure the correct plugin and derived 
class is loaded (be it TOracleServer, TMySQLServer, etc). This is like how 
things are done for TFile via TFile::Open(). This makes you code 
independent of an actual specific implementation.

Cheers, Fons.

On 01/10/2010 11:30, Bernd Reinhold wrote:
> Hi Rene!
>
> Yes, I understand that TSQLServer is a base class to TMySQLServer,
> TOracle... etc., but it's not an abstract base class, despite the fact that
> in http://root.cern.ch/root/html/TSQLServer.html it says so.
> So I have two choices to connect to a MySQL server: TSQLServer or
> TMySQLServer (we tested both, either worked).
>
> Therefore I was wondering
>  >> ..., if one (e.g. TMySQLServer) is preferred above the
>  >> other (TSQLServer), e.g. for performance reasons or if they are
>  >> completely equivalent to use.
>
> They seemed equivalent when testing, but I was wondering about subtle or
> not so subtle differences?!

[ROOT] TTree Draw 5 variables

Re: [ROOT] TTree Draw 5 variables

Andrea,

You are right. Currently you have to do something like:
  T.Draw("x:y:z:u:v","","para goff");
   T.GetVal(4);

Hoping that we can improve this soon.

Rene Brun

Andrea Massironi wrote:
> Dear Rooters,
>     I'm wondering if it's possible to use the "Draw" of a TTree with 5 
> variables with the "goff" option and then get the results with 
> "GetVal(Int_i i)", like in the following example.
>
> I get the following error:
>
>     Error in <TSelectorDraw::Begin>: Too many variables. Use the
>     option "para", "gl5d" or "candle" to display more than 4 variables.
>
> even if in http://root.cern.ch/root/html/TTree.html I read
> "Giving more than 4 variables without the option=para or
>   option=candle or option=goff will produce an error."
>   
> But "goff" seems to be an available option.
>
>
> Thanks,
>     Andrea
>
>
>
>     TTree* myTree = new TTree("myTree","myTree");
>
>     double x,y,z,t,w;
>
>     myTree->Branch("x",&x,"x/D");
>     myTree->Branch("y",&x,"y/D");
>     myTree->Branch("z",&x,"z/D");
>     myTree->Branch("t",&x,"t/D");
>     myTree->Branch("w",&x,"w/D");
>
>
>     for (int i=0; i<100; i++){
>      x = i;
>      y = i+1;
>      z = i+2;
>      t = i+3;
>      w = i+4;
>      myTree->Fill();
>     }
>
>
>     myTree->Draw("x:y:z:t:w","","goff");
>
>     Double_t *vX = myTree->GetVal(0);
>     Double_t *vY = myTree->GetVal(1);
>     Double_t *vZ = myTree->GetVal(2);
>     Double_t *vT = myTree->GetVal(3);
>     Double_t *vW = myTree->GetVal(4);
>
>

Re: [ROOT] TTree Draw 5 variables

Thank you!
It works.

     Andrea

On 10/01/2010 03:32 PM, Rene Brun wrote:
> Andrea,
>
> You are right. Currently you have to do something like:
>  T.Draw("x:y:z:u:v","","para goff");
>   T.GetVal(4);
>
> Hoping that we can improve this soon.
>
> Rene Brun
>
> Andrea Massironi wrote:
>> Dear Rooters,
>>     I'm wondering if it's possible to use the "Draw" of a TTree with 
>> 5 variables with the "goff" option and then get the results with 
>> "GetVal(Int_i i)", like in the following example.
>>
>> I get the following error:
>>
>>     Error in <TSelectorDraw::Begin>: Too many variables. Use the
>>     option "para", "gl5d" or "candle" to display more than 4 variables.
>>
>> even if in http://root.cern.ch/root/html/TTree.html I read
>> "Giving more than 4 variables without the option=para or
>>   option=candle or option=goff will produce an error."
>>   But "goff" seems to be an available option.
>>
>>
>> Thanks,
>>     Andrea
>>
>>
>>
>>     TTree* myTree = new TTree("myTree","myTree");
>>
>>     double x,y,z,t,w;
>>
>>     myTree->Branch("x",&x,"x/D");
>>     myTree->Branch("y",&x,"y/D");
>>     myTree->Branch("z",&x,"z/D");
>>     myTree->Branch("t",&x,"t/D");
>>     myTree->Branch("w",&x,"w/D");
>>
>>
>>     for (int i=0; i<100; i++){
>>      x = i;
>>      y = i+1;
>>      z = i+2;
>>      t = i+3;
>>      w = i+4;
>>      myTree->Fill();
>>     }
>>
>>
>>     myTree->Draw("x:y:z:t:w","","goff");
>>
>>     Double_t *vX = myTree->GetVal(0);
>>     Double_t *vY = myTree->GetVal(1);
>>     Double_t *vZ = myTree->GetVal(2);
>>     Double_t *vT = myTree->GetVal(3);
>>     Double_t *vW = myTree->GetVal(4);
>>
>>
>

[ROOT] draw ellipses or circles

Hi,

I want to know how to draw a ellipse with root if I have the data 
points. I mean, if I have the points, will TGraph class works?
Cheers,

Julia 

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Re: [ROOT] draw ellipses or circles

Hi
Yes it will work. Use it with option L.
Cheers

Olivier

Le 1 oct. 2010 à 18:26, Julia Campa Romero <Julia.Campa <at> ciemat.es> a écrit :

> Hi,
> 
> I want to know how to draw a ellipse with root if I have the data points. I mean, if I have the points, will
TGraph class works?
> Cheers,
> 
> Julia 
> ----------------------------
> Confidencialidad: Este mensaje y sus ficheros adjuntos se dirige exclusivamente a su destinatario y
puede contener información privilegiada o confidencial. Si no es vd. el destinatario indicado, queda
notificado de que la utilización, divulgación y/o copia sin autorización está prohibida en virtud
de la legislación vigente. Si ha recibido este mensaje por error, le rogamos que nos lo comunique
inmediatamente respondiendo al mensaje y proceda a su destrucción.
> 
> Disclaimer: This message and its attached files is intended exclusively for its recipients and may
contain confidential information. If you received this e-mail in error you are hereby notified that any
dissemination, copy or disclosure of this communication is strictly prohibited and may be unlawful. In
this case, please notify us by a reply and delete this email and its contents immediately. ----------------------------
> 

Re: [ROOT] Getting alpha and beta values from RooStats::ProfileLikelihoodCalculator

[ROOT] ASCII data usage

RE: [ROOT] ASCII data usage