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gerrors.py
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1 ## \file
2 ## \ingroup tutorial_pyroot
3 ## \notebook -js
4 ## A Simple Graph with error bars
5 ##
6 ## \macro_image
7 ## \macro_code
8 ##
9 ## \author Wim Lavrijsen
10 
11 from ROOT import TCanvas, TGraphErrors
12 from ROOT import gROOT
13 from array import array
14 
15 c1 = TCanvas( 'c1', 'A Simple Graph with error bars', 200, 10, 700, 500 )
16 
17 c1.SetGrid()
18 c1.GetFrame().SetFillColor( 21 )
19 c1.GetFrame().SetBorderSize( 12 )
20 
21 n = 10;
22 x = array( 'f', [ -0.22, 0.05, 0.25, 0.35, 0.5, 0.61, 0.7, 0.85, 0.89, 0.95 ] )
23 ex = array( 'f', [ 0.05, 0.1, 0.07, 0.07, 0.04, 0.05, 0.06, 0.07, 0.08, 0.05 ] )
24 y = array( 'f', [ 1, 2.9, 5.6, 7.4, 9.0, 9.6, 8.7, 6.3, 4.5, 1 ] )
25 ey = array( 'f', [ 0.8, 0.7, 0.6, 0.5, 0.4, 0.4, 0.5, 0.6, 0.7, 0.8 ] )
26 
27 gr = TGraphErrors( n, x, y, ex, ey )
28 gr.SetTitle( 'TGraphErrors Example' )
29 gr.SetMarkerColor( 4 )
30 gr.SetMarkerStyle( 21 )
31 gr.Draw( 'ALP' )
32 
33 c1.Update()
SetBorderSize
c SetBorderSize(2)
SetFillColor
h1 SetFillColor(kGreen)
TGraphErrors
A TGraphErrors is a TGraph with error bars.
Definition: TGraphErrors.h:26
TCanvas
The Canvas class.
Definition: TCanvas.h:23