ROOT
v6-22
Reference Guide
df024_Display.C
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/// \file
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/// \ingroup tutorial_dataframe
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/// \notebook
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/// This tutorial shows how to use the Display action
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///
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/// \macro_code
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/// \macro_output
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///
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/// \date August 2018
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/// \author Enrico Guiraud, Danilo Piparo, Enric Tejedor Saavedra CERN, Massimo Tumolo Politecnico di Torino
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void
df024_Display
()
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{
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// Setting up a Dataframe with some data
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unsigned
long
long
y
= 1;
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int
x
= 1;
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double
w = 1;
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double
z = 1;
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ROOT::RDataFrame
df(10);
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auto
d
= df.Define(
"y"
, [&
y
]() {
return
y
*= 100; })
// A column with ulongs
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.Define(
"x"
,
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[&
x
]() {
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return
std::vector<int>({
x
++,
x
++,
x
++,
x
++});
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})
// A column with four-elements collection
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.Define(
"w"
, [&w]() {
return
w *= 1.8; })
// A column with doubles
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.Define(
"z"
, [&z]() {
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z *= 1.1;
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return
std::vector<std::vector<double>>({{z, ++z}, {z, ++z}, {z, ++z}});
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});
// A column of matrices
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// Preparing the RResultPtr<RDisplay> object with all columns and default number of entries
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auto
d1 =
d
.Display(
""
);
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// Preparing the RResultPtr<RDisplay> object with two columns and default number of entries
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auto
d2 =
d
.Display({
"x"
,
"y"
});
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// Printing the short representations, the event loop will run
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std::cout <<
"The following is the representation of all columns with the default nr of entries"
<< std::endl;
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d1->Print();
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std::cout <<
"\n\nThe following is the representation of two columns with the default nr of entries"
<< std::endl;
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d2->Print();
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}
d
#define d(i)
Definition:
RSha256.hxx:102
ROOT::RDataFrame
ROOT's RDataFrame offers a high level interface for analyses of data stored in TTrees,...
Definition:
RDataFrame.hxx:42
y
Double_t y[n]
Definition:
legend1.C:17
x
Double_t x[n]
Definition:
legend1.C:17
df024_Display
Definition:
df024_Display.py:1
tutorials
dataframe
df024_Display.C
ROOT v6-22 - Reference Guide Generated on Fri Apr 1 2022 11:53:17 (GVA Time) using Doxygen 1.9.4