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Reference Guide
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graphs
multigraph.C File Reference
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Graphs tutorials
Detailed Description
Create and Draw a
TMultiGraph
.
TCanvas
* multigraph()
{
gStyle
->
SetOptFit
();
TCanvas
*c1 =
new
TCanvas
(
"c1"
,
"multigraph"
,700,500);
c1->
SetGrid
();
// draw a frame to define the range
TMultiGraph
*mg =
new
TMultiGraph
();
// create first graph
const
Int_t
n1 = 10;
Double_t
px1[] = {-0.1, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
Double_t
py1[] = {-1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
Double_t
ex1[] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
Double_t
ey1[] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
TGraphErrors
*gr1 =
new
TGraphErrors
(n1,px1,py1,ex1,ey1);
gr1->
SetMarkerColor
(kBlue);
gr1->
SetMarkerStyle
(21);
gr1->
Fit
(
"pol6"
,
"q"
);
mg->
Add
(gr1);
// create second graph
const
Int_t
n2 = 10;
Float_t
x2[] = {-0.28, 0.005, 0.19, 0.29, 0.45, 0.56,0.65,0.80,0.90,1.01};
Float_t
y2[] = {2.1,3.86,7,9,10,10.55,9.64,7.26,5.42,2};
Float_t
ex2[] = {.04,.12,.08,.06,.05,.04,.07,.06,.08,.04};
Float_t
ey2[] = {.6,.8,.7,.4,.3,.3,.4,.5,.6,.7};
TGraphErrors
*gr2 =
new
TGraphErrors
(n2,x2,y2,ex2,ey2);
gr2->
SetMarkerColor
(kRed);
gr2->
SetMarkerStyle
(20);
gr2->
Fit
(
"pol5"
,
"q"
);
mg->
Add
(gr2);
mg->
Draw
(
"ap"
);
//force drawing of canvas to generate the fit TPaveStats
c1->
Update
();
TPaveStats
*stats1 = (
TPaveStats
*)gr1->
GetListOfFunctions
()->
FindObject
(
"stats"
);
TPaveStats
*stats2 = (
TPaveStats
*)gr2->
GetListOfFunctions
()->
FindObject
(
"stats"
);
stats1->
SetTextColor
(kBlue);
stats2->
SetTextColor
(kRed);
stats1->
SetX1NDC
(0.12); stats1->
SetX2NDC
(0.32); stats1->
SetY1NDC
(0.75);
stats2->
SetX1NDC
(0.72); stats2->
SetX2NDC
(0.92); stats2->
SetY1NDC
(0.78);
c1->
Modified
();
return
c1
;
}
Author
Rene Brun
Definition in file
multigraph.C
.