RE: gStyle->SetErrorX(dx)

Yes by definition, if you use TGraphAsymmErrors the erros should be provided.
If you do not want to use errors use TGraph instead. There is nothing to improve here.

-----Original Message-----
From: Alexander Mann [mailto:amann_at_uni-goettingen.de] Sent: Wednesday, June 02, 2010 10:30 AM
To: Olivier Couet
Cc: roottalk_at_root.cern.ch
Subject: Re: [ROOT] gStyle->SetErrorX(dx)

So if I only want to have the y errors drawn using TGraphAsymmErrors, I always have to provide an additional array with 0s. Maybe this is sth. that could be improved in future releases :)

cu,
Alexander

Am 02.06.2010 10:27, schrieb Olivier Couet:
> gStyle->SetErrorX(dx) works for histogram. Here you draw a
> TGraphAsymmErrors.
> gStyle->SetErrorX(dx) as no effect on TGraphAsymmErrors.
> If one use TGraphAsymmErrors it is assume it is to the errors.
> The graph without errors is TGraph.
>
> -----Original Message-----
> From: Alexander Mann [mailto:amann_at_uni-goettingen.de]
> Sent: Wednesday, June 02, 2010 10:24 AM
> To: Olivier Couet
> Cc: roottalk_at_root.cern.ch
> Subject: Re: [ROOT] gStyle->SetErrorX(dx)
>
>
> Hi,
>
> so what's wrong with this code then:
>
> {
>
> gStyle->SetErrorX(0.0);
>
> h1 = new TH1F("h1", "h1", 2, -0.5, 1.5);
> h2 = new TH1F("h2", "h2", 2, -0.5, 1.5);
>
> h1->Fill(0);
> h2->Fill(0);
> h2->Fill(0);
> h2->Fill(1);
>
> h = new TGraphAsymmErrors(h1, h2);
>
> h->Draw("AL");
>
> }
>
> Does draw x error bars.
>
> Is there a way to disable those without using an additional array?
>
> cu,
> Alexander
>
>
> Am 02.06.2010 10:05, schrieb Olivier Couet:
>> This setting dx=0 in gStyle->SetErrorX(dx) remove the errors bar
> display
>> along X.
>> As it is explain in the doc.
>>
>> -----Original Message-----
>> From: owner-roottalk_at_root.cern.ch

[mailto:owner-roottalk_at_root.cern.ch]
>> On Behalf Of Alexander Mann
>> Sent: Tuesday, June 01, 2010 7:38 PM
>> To: roottalk_at_root.cern.ch
>> Subject: [ROOT] gStyle->SetErrorX(dx)
>>
>> Hi,
>>
>> the documentation http://root.cern.ch/root/html/TGraphPainter.html
> says:
>>
>> "gStyle->SetErrorX(dx) controls the size of the error along x. dx = 0
>> removes the error along x."
>>
>> Does this method to get rid of the x-error bars work?
>>
>> cu,
>> Alexander
>>
>
Received on Wed Jun 02 2010 - 10:32:11 CEST