The simplest case would be: int num_rows = Rf_length(VECTOR_ELT(dataframe, 0)); int num_columns = Rf_length(dataframe);
There may be edge cases for which this doesn't work; would need to look into how the dim primitive is implemented to be sure. - Murray On Mon, Mar 31, 2014 at 4:40 PM, Sandip Nandi <sanna...@umail.iu.edu> wrote: > Hi , > > Is there any C API to the R API nrow of dataframe ? > > x<- data.frame() > n<- nrow(x) > print(n) > 0 > > > Example : > My C function which deals with data frame looks like and I don't to send > the number of rows of data frame .I want to detect it from the function > itself, my function take data frame as argument and do some on it. I want > API equivalent to nrow. I tried Rf_nrows,Rf_ncols . No much help. > > SEXP writeRR(SEXP dataframe) { > > } > > > Any help is very appreciated. > > Thanks, > Sandip > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel