[Rcpp-devel] trouble creating a dataframe

[Pratibha Rana]

Hi,

I am at my wits end trying to create  a dataframe from a list of values
that I have. here's the code

try{
       int size =  argTypes.getColumnCount();
       std::vector<std::string> nameVec(size);
       std::vector<int> lenVec(size);
       std::vector<int> scaleVec(size);

       for (size_t i = 0; i < size; ++i) {
           //get the datatype
           vt = argTypes.getColumnType(i);
           BaseDataOID BDOid = vt.getTypeOid();

           //convert the Oid to string name
           std::string columnType = Oid2String(BDOid);

           //get the length for string types, precision for time and
numerics and scale for numerics
           int length = 0;
           int scale= 0;
           getTypeLength(vt, length, scale);

           //add the values to the vectors
           nameVec.push_back(columnType);
           lenVec.push_back(length);
           scaleVec.push_back(scale);
       }

       //create the dataframe
       Rcpp::List df = Rcpp::List::create(Rcpp::Named("datatype",nameVec),
                                          Rcpp::Named("length",lenVec),
                                          Rcpp::Named("scale",scaleVec));
       Rcpp::DataFrame df_final = Rcpp::DataFrame::create(df);
       return df_final;

   }
   catch(std::exception &e) {
       throw;
   }


The std::vectors are created fine but the list is not created
(gdb) p R_PV(df)
$3 = 0


I have tried a lot of variation like creating the dataframe directly
without first creating the list. Nothing seems to be working.



Thanks
Pratibha
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