cdt | R Documentation |
Note that this interface is going to be changed in next release. Some of internally used C routines are now exported. This interface should be considered experimental. List of exported C routines and their signatures are provided below in the usage section.
# SEXP subsetDT(SEXP x, SEXP rows, SEXP cols); # p_dtCsubsetDT = R_GetCCallable("data.table", "CsubsetDT");
For details how to use those see Writing R Extensions manual Linking to native routines in other packages section.
Be aware C routines are likely to have less input validation than their corresponding R interface. For example one should not expect DT[-5L]
will be equal to .Call(CsubsetDT, DT, -5L, seq_along(DT))
because translation of i=-5L
to seq_len(nrow(DT))[-5L]
might be happening on R level. Moreover checks that i
argument is in range of 1:nrow(DT)
, missingness, etc. might be happening on R level too.
https://cran.r-project.org/doc/manuals/r-release/R-exts.html
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