search for: rf_ncol

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2014 Mar 31
1
C API to get numrow of data frame
...t;- 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]]
2009 Mar 27
0
imporving performance of slicing on matrices and S4 their derivatives
...index="integer"), body=body, includes="#include <string.h>") ## get A COPY of the @.Data slot from an object derived from numeric/matrix body = "/* test performance of getting A COPY of @.Data, keeping dimnames */ int nrow = Rf_nrows(m); int ncol = Rf_ncols(m); SEXP res, dim; PROTECT(res = allocVector(REALSXP, nrow*ncol)); PROTECT(dim = allocVector(INTSXP, 2)); INTEGER(dim)[0] = nrow; INTEGER(dim)[1] = ncol; SET_DIM(res, dim); if (GET_DIMNAMES(m)!= R_NilValue) SET_DIMNAMES(res, Rf_duplicate(GET_DIMNAMES(m))); i...