Logo ROOT  
Reference Guide
DataFrame.C File Reference

Detailed Description

View in nbviewer Open in SWAN

void DataFrame()
{
using namespace ROOT::R;
// Creating variables
std::vector<Double_t> v2 {0.101, 0.202, 0.303};
std::array<Int_t,3> v3{ {1,2,3} };
std::list<std::string> names {"v1", "v2", "v3"};
// Assigning values
v1[0]=1;
v1[1]=2;
v1[2]=3;
// Creating dataframe object with its labels
TRDataFrame df1(Label["var1"]=v1,Label["var2"]=v2,Label["var3"]=v3,Label["strings"]=names);
// Passing dataframe to R's environment
r["df1"]<<df1;
r<<"print(df1)";
// Adding colunms to dataframe
//filling the vector fro R's environment
r["c(-1,-2,-3)"]>>v4;
//adding new colunm to df1 with name var4
df1["var4"]=v4;
//updating df1 in R's environment
r["df1"]<<df1;
//printing df1
r<<"print(df1)";
// Getting dataframe from R's environment
r<<"df2<-data.frame(v1=c(0.1,0.2,0.3),v2=c(3,2,1))";
r["df2"]>>df2;
TVectorD v(3);
df2["v1"]>>v;
v.Print();
df2["v2"]>>v;
v.Print();
// Working with colunms between dataframes
df2["v3"]<<df1["strings"];
//updating df2 in R's environment
r["df2"]<<df2;
r<<"print(df2)";
// Passing values from colunm v3 of df2 to var1 of df1
df2["v3"]>>df1["var1"];
// Updating df1 in R's environment
r["df1"]<<df1;
r<<"print(df1)";
}
Author

Definition in file DataFrame.C.

r
ROOT::R::TRInterface & r
Definition: Object.C:4
v
@ v
Definition: rootcling_impl.cxx:3635
DataFrame
void DataFrame()
Definition: DataFrame.C:9
TVectorT
Definition: TMatrixTBase.h:78
v1
@ v1
Definition: rootcling_impl.cxx:3637
ROOT::R
Definition: RExports.h:56
v3
@ v3
Definition: rootcling_impl.cxx:3639
v2
@ v2
Definition: rootcling_impl.cxx:3638
v4
@ v4
Definition: rootcling_impl.cxx:3640
ROOT::R::TRInterface::Instance
static TRInterface & Instance()
static method to get an TRInterface instance reference
Definition: TRInterface.cxx:185
ROOT::R::Label
const Rcpp::internal::NamedPlaceHolder & Label
ROOT::R::TRDataFrame
Definition: TRDataFrame.h:189