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.
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