[Rcpp-devel] data.frame from R to C++?

Dirk Eddelbuettel edd at debian.org
Fri Apr 8 16:56:57 CEST 2011

Ok, I now committed a slightly nice example to RcppExamples, a package I
should revamp to contain more examples.  In there, we now receive a
data.frame, operate on each column, create a new data and return old and new.

The core of the code (inside the try/catch protection) is

      // 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 = 

      // and return old and new in list

Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com

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