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This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Tuesday, March 28, 2023 at 09:54 AM.
using namespace ROOT::R;
Creating variables
TVectorD v1(3);
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;
auto &r = TRInterface::Instance();
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
TVectorD v4(3);
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
TRDataFrame df2;
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)";