The derivative table resides in the function D. In S+ that table is extensible because it is written in the S language. R is faster but less flexible, since that table is programmed in C. It would be useful if R provided a mechanism for extending the derivative table, or barring that, provided a broader table, beginning with expm1, log1p, log2 and log10.
While the proposed additions are straight-forward, their absence complicates what otherwise could be much simpler, such as using deriv() or deriv3() to generate functions, such as an nls model. Thanks, [[alternative HTML version deleted]] ______________________________________________ ESS-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/ess-help