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.
Note that the RcppClassic package has been deprecated since 2010, all new development should use the Rcpp package instead.
Rcpp::DataFrame is fully defined in
the respective header file. The C++ source file corresponding to the this function does the
following (inside of a try/catch block):
// construct the data.frame object
Rcpp::DataFrame DF = Rcpp::DataFrame(Dsexp);// 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));
## Not run:
# RcppDataFrame()
# ## End(Not run)
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