RcppDataFrame: Rcpp::DataFrame example for Rcpp

In eddelbuettel/rcppexamples: Examples using 'Rcpp' to Interface R and C++

Rcpp::DataFrame example for Rcpp

Description

A DataFrame can be passed C++ and can be instantiated as a corresponding C++ object using the Rcpp API.

This example shows (in the corresponding C++ code) how to access, modify and create a data frame.

Details

Usage of Rcpp::DataFrame is fully defined in the respective header file.

The C++ source file corresponding to the this function does the following:

      // we receive a 'DF' data.frame object
      // and access each column by name
      Rcpp::IntegerVector a = DF["a"];
      Rcpp::CharacterVector b = DF["b"];
      Rcpp::DateVector c = DF["c"];
      
      // do something
      a[2] = 42;
      b[1] = "foo";
      c[0] = c[0] + 7;                      // move up a week

      // create a new data frame
      Rcpp::DataFrame NDF = 
	  Rcpp::DataFrame::create(Rcpp::Named("a")=a,
				  Rcpp::Named("b")=b,
				  Rcpp::Named("c")=c);

      // and return old and new in list
      return(Rcpp::List::create(Rcpp::Named("origDataFrame")=DF,
				Rcpp::Named("newDataFrame")=NDF));
  

Author(s)

Dirk Eddelbuettel and Romain Francois

Examples

  ## Not run: 
  RcppDataFrame()
  
## End(Not run)

eddelbuettel/rcppexamples documentation built on March 8, 2024, 1:37 p.m.