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Reference Guide
DataFrame.C
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1// Author: Omar Zapata
2#include<TRInterface.h>
3#include<TRDataFrame.h>
4#include<vector>
5#include<array>
6
7using namespace ROOT::R;
8
9void DataFrame() {
10//creating variables
11 TVectorD v(3);
12 std::vector<Double_t> sv(3);
13//std::array<Int_t,3> a{ {1,2,3} };
14
15//assinging values
16 v[0]=1;
17 v[1]=2;
18 v[2]=3;
19
20 sv[0]=0.101;
21 sv[1]=0.202;
22 sv[2]=0.303;
23
24
25 TRInterface &r=TRInterface::Instance();
26// r.SetVerbose(kTRUE);
27 std::list<std::string> names;
28 names.push_back("v1");
29 names.push_back("v2");
30 names.push_back("v3");
31
32 TRDataFrame df(Label["var1"]=v,Label["var2"]=sv,Label["var3"]=sv,Label["strings"]=names);
33 TRDataFrame df2;
34
35
36 r["df"]<<df;
37
38//printting results
39 std::cout<<"-----------Printing Results---------\n";
40 r<<"print(df)";
41
42 std::cout<<"------------------------------------\n";
43 df["var1"]>>sv;
44
45 r["v"]<<sv;
46 r<<"print(v)";
47 df["var3"]<<sv;
48
49 df["var4"]<<sv;
50 df["var5"]=names;
51 r["df"]<<df;
52 std::cout<<"------------------------------------\n";
53 r<<"print(df)";
54
55 //tests of operators between dataframe and r interface object
56 std::cout<<"------------------------------------\n";
57 r<<"df2<-data.frame(v1=c(1,2,3),v2=c('a','b','c'),v3=c(3,2,1))";
58 r["df2"]>>df2;
59 r["v2"]<<df2["v2"];
60 r<<"print(v2)";
61 r["v3"]<<df2["v3"];
62 r<<"print(v3)";
63
64 //tests between dataframes operator
65 std::cout<<"------------------------------------\n";
66 df2["v4"]<<df2["v3"];
67 df2["v2"]<<df2["v3"];
68 r["df2"]<<df2;
69 r<<"print(df2)";
70
71 //the next line is not working
72 df2["v5"]=df2["v1"];
73 df2["v1"]=df2["v3"];
74 df2["v6"]<<df2["v5"];
75 r["df2"]<<df2;
76 r<<"print(df2)";
77
78 // the next line donk work, the operator >> is not supported between Bindings(FIXED NOW))
79 df2["v6"]>>df2["v1"];
80
81 //basic methods
82 std::cout<<"------------------------------------\n";
83 std::cout<<"nrows = "<<df2.GetNrows()<<std::endl;
84 std::cout<<"ncols = "<<df2.GetNcols()<<std::endl;
85
86
87 r["v5"]<<df2["v5"];
88 r<<"print(v5)";
89 df2["v5"]>>df["var1"];
90 r["v5"]<<df2["v5"];
91 r<<"print(v5)";
92
93
94 std::cout<<"-----Cast---"<<std::endl;
96 r["df=data.frame(v1=c(0.1,0.2,0.3),v2=c(0.4,0.5,0.6))"]>>dfm;
97 dfm.Print();
98
99 dfm.Print("v1");
100
102 m.Print();
103
104 //Error Handling
105/* std::cout<<"------------------------------------\n";
106 try{
107 r["qwe"]<<df2["qwe"];
108 }
109 catch(Rcpp::index_out_of_bounds& __ex__){
110 ::Error("operator=", "%s",__ex__.what());
111 forward_exception_to_r( __ex__ ) ;
112 }
113 catch(...){::Error("operator=", "Can not assign in v5");}
114*/
115}
ROOT::R::TRInterface & r
Definition: Object.C:4
float Float_t
Definition: RtypesCore.h:55
void DataFrame()
Definition: DataFrame.C:9
This is a class to create DataFrames from ROOT to R.
Definition: TRDataFrame.h:176
Int_t GetNcols()
Method to get the number of colunms.
Definition: TRDataFrame.h:394
TMatrixT< T > AsMatrix()
Method to get dataframe as matrix.
Definition: TRDataFrame.h:417
void Print(const Char_t *label="")
Method to print the dataframe in stdout or a column given the label.
Definition: TRDataFrame.h:427
Int_t GetNrows()
Method to get the number of rows.
Definition: TRDataFrame.h:399
ROOT R was implemented using the R Project library and the modules Rcpp and RInside
Definition: TRInterface.h:136
TMatrixT.
Definition: TMatrixT.h:39
namespace associated R package for ROOT.
Definition: RExports.h:56
const Rcpp::internal::NamedPlaceHolder & Label
auto * m
Definition: textangle.C:8