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gr005_apply.C
Go to the documentation of this file.
1
/// \file
2
/// \ingroup tutorial_graphs
3
/// \notebook
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/// \preview A macro to demonstrate the functionality of TGraph::Apply() method.
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/// TGraph::Apply applies a function `f` to all the data TGraph points, `f` may be a 1-D function TF1 or 2-d function TF2.
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/// The Y values of the graph are replaced by the new values computed using the function.
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///
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///
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/// The Apply() method can be used as well for TGraphErrors and TGraphAsymmErrors.
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///
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/// \macro_image
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/// \macro_code
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///
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/// \author Miro Helbich
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void
gr005_apply
() {
17
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const
Int_t
npoints
=3;
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Double_t
xaxis
[
npoints
] = {1.,2.,3.};
20
Double_t
yaxis
[
npoints
] = {10.,20.,30.};
21
22
TGraph
*
gr1
=
new
TGraph
(
npoints
,
xaxis
,
yaxis
);
23
TF2
*
ff
=
new
TF2
(
"ff"
,
"-1./y"
);
//Defining the function `f`
24
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TCanvas
*
c1
=
new
TCanvas
(
"c1"
,
"c1"
, 0,0,700,500);
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c1
->Divide(2,1);
27
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c1
->cd(1);
29
gr1
->DrawClone(
"A*"
);
//Using DrawClone to create a copy of the graph in the canvas.
30
c1
->cd(2);
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gr1
->Apply(
ff
);
//Applies the function `f` to all the data TGraph points
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gr1
->Draw(
"A*"
);
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/* Without DrawClone, the modifications to gr1 via Apply(ff) are reflected in the original graph
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displayed in c1 (the two drawn graphs are not independent). */
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}
Int_t
int Int_t
Definition
RtypesCore.h:45
Double_t
double Double_t
Definition
RtypesCore.h:59
TRangeDynCast
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
Definition
TCollection.h:358
ROOT::Detail::TRangeCast
Definition
TCollection.h:311
TCanvas
The Canvas class.
Definition
TCanvas.h:23
TF2
A 2-Dim function with parameters.
Definition
TF2.h:29
TGraph
A TGraph is an object made of two arrays X and Y with npoints each.
Definition
TGraph.h:41
c1
return c1
Definition
legend1.C:41
tutorials
visualisation
graphs
gr005_apply.C
ROOT master - Reference Guide Generated on Mon Feb 24 2025 14:45:13 (GVA Time) using Doxygen 1.10.0