The R Project SVN R

/* included  twice  from  ./split.c   after defining
    _L_INTSXP_, _L_INTEG_,  _L_int_
    ===========  =========  ========    as
      INTSXP  ,  INTEGER ,  int         or
      REALSXP ,  REAL    ,  R_xlen_t
*/
{
    PROTECT(counts = allocVector(_L_INTSXP_, nlevs));
    for (int i = 0; i < nlevs; i++) _L_INTEG_(counts)[i] = 0;
    R_xlen_t i, i1;
    MOD_ITERATE1(nobs, nfac, i, i1, {
    int j = INTEGER(f)[i1];
    if (j != NA_INTEGER) {
        /* protect against malformed factors */
        if (j > nlevs || j < 1) error(_("factor has bad level"));
        _L_INTEG_(counts)[j - 1]++;
    }
    });
    /* Allocate a generic vector to hold the results. */
    /* The i-th element will hold the split-out data */
    /* for the ith group. */
    PROTECT(vec = allocVector(VECSXP, nlevs));
    for (R_xlen_t i = 0;  i < nlevs; i++) {
    SET_VECTOR_ELT(vec, i, 
               allocVector(TYPEOF(x), (_L_int_)_L_INTEG_(counts)[i]));
    setAttrib(VECTOR_ELT(vec, i), R_LevelsSymbol,
          getAttrib(x, R_LevelsSymbol));
    if(have_names)
        setAttrib(VECTOR_ELT(vec, i), R_NamesSymbol,
              allocVector(STRSXP, (_L_int_)_L_INTEG_(counts)[i]));
    }
    for (int i = 0; i < nlevs; i++) _L_INTEG_(counts)[i] = 0;
    MOD_ITERATE1(nobs, nfac, i, i1, {
    int j = INTEGER(f)[i1];
    if (j != NA_INTEGER) {
        _L_int_ k = (_L_int_)_L_INTEG_(counts)[j - 1];
        switch (TYPEOF(x)) {
        case LGLSXP:
        case INTSXP:
        INTEGER(VECTOR_ELT(vec, j - 1))[k] = INTEGER(x)[i];
        break;
        case REALSXP:
        REAL(VECTOR_ELT(vec, j - 1))[k] = REAL(x)[i];
        break;
        case CPLXSXP:
        COMPLEX(VECTOR_ELT(vec, j - 1))[k] = COMPLEX(x)[i];
        break;
        case STRSXP:
        SET_STRING_ELT(VECTOR_ELT(vec, j - 1), k, STRING_ELT(x, i));
        break;
        case VECSXP:
        SET_VECTOR_ELT(VECTOR_ELT(vec, j - 1), k, VECTOR_ELT(x, i));
        break;
        case RAWSXP:
        RAW(VECTOR_ELT(vec, j - 1))[k] = RAW(x)[i];
        break;
        default:
        UNIMPLEMENTED_TYPE("split", x);
        }
        if(have_names) {
        nmj = getAttrib(VECTOR_ELT(vec, j - 1), R_NamesSymbol);
        SET_STRING_ELT(nmj, k, STRING_ELT(nm, i));
        }
        _L_INTEG_(counts)[j - 1] += 1;
    }
    });
}