Draw("p") marker "length"?

ROOT
1

Hi!

I make a Draw(“p”) but I want also to print the “length” of the bin… Like an Xaxis error…

Any ideas?

Many thanks!

2

What are you drawing ? A polymarker ?
For instance, you can use TGraphErrors and plot it with the option P.

3

I have a simple histogram…

And i want the one I attach…

4

Draw with the option E.

5

all details here:
root.cern.ch/root/html/THistPainter.html#HP09

6

This is what I’m looking for but I have this strange behavour…

Should I do it with TGraph?

Screen shot 2010-09-13 at 16.30.34 .png1163×512 7.62 KB

7

Can you send a small running macro reproducing the problem ?

8

Can I lose the y-axis-errors??

TCanvas *c1 = new TCanvas(“c1”, “Sigma MC”, 1200, 900);
TH1F *h1 = new TH1F(“h1”,“Sigma MC”, 5, 0.5, 5.5);
h1->SetBinContent(2,.022);
h1->SetBinContent(4,.014);
h1->Draw(“E1”);
h1->SetMarkerStyle(22);
h1->SetMarkerColor(kRed);
c1->SetGrid();

Screen shot 2010-09-13 at 16.46.23 .png924×681 7.19 KB

9

You say you do not want the Y error (“can I lose Y axis errors ?”) .
In that case you should use:
root.cern.ch/root/html/TGraphErrors.html
see also:
root.cern.ch/root/html/TGraphPainter.html#GP03

10

Loads of thanks!!!