Description Details Author(s) See Also Examples
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.
Note that the RcppClassic package has been deprecated since 2010, all new development should use the Rcpp package instead.
Usage of 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):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | // 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));
|
Dirk Eddelbuettel and Romain Francois
See the RcppExamples-package for examples of the recommended Rcpp API and Rcpp-package for documentation on the recommended API to extend R with C++ code, while the deprecated RcppClassic-package documents the older, deprecated API.
1 2 3 4 | ## Not run:
RcppDataFrame()
## End(Not run)
|
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