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gerrors.py File Reference

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 gerrors
 

Detailed Description

View in nbviewer Open in SWAN A Simple Graph with error bars

pict1_gerrors.py.png
from ROOT import TCanvas, TGraphErrors
from ROOT import gROOT
from array import array
c1 = TCanvas( 'c1', 'A Simple Graph with error bars', 200, 10, 700, 500 )
c1.SetGrid()
c1.GetFrame().SetFillColor( 21 )
c1.GetFrame().SetBorderSize( 12 )
n = 10;
x = array( 'f', [ -0.22, 0.05, 0.25, 0.35, 0.5, 0.61, 0.7, 0.85, 0.89, 0.95 ] )
ex = array( 'f', [ 0.05, 0.1, 0.07, 0.07, 0.04, 0.05, 0.06, 0.07, 0.08, 0.05 ] )
y = array( 'f', [ 1, 2.9, 5.6, 7.4, 9.0, 9.6, 8.7, 6.3, 4.5, 1 ] )
ey = array( 'f', [ 0.8, 0.7, 0.6, 0.5, 0.4, 0.4, 0.5, 0.6, 0.7, 0.8 ] )
gr = TGraphErrors( n, x, y, ex, ey )
gr.SetTitle( 'TGraphErrors Example' )
gr.SetMarkerColor( 4 )
gr.SetMarkerStyle( 21 )
gr.Draw( 'ALP' )
c1.Update()
Author
Wim Lavrijsen

Definition in file gerrors.py.