Thank you. The nlsr package will be a satisfactory alternative once the bug in fnDeriv(..., hessian=TRUE) is patched. I have notified the maintainer.
Jerry -----Original Message----- From: Duncan Murdoch [mailto:murdoch.dun...@gmail.com] Sent: Friday, February 17, 2017 6:05 PM To: Jerry Lewis; r-devel@r-project.org Subject: Re: [Rd] Wish List: Extensions to the derivatives table On 17/02/2017 1:59 PM, Jerry Lewis wrote: > 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. Currently unsupported mathematical functions of > one argument include expm1, log1p, log2, log10, cospi, sinpi, and tanpi. > > While manual differentiation of these proposed additions is straight-forward, > their absence complicates what otherwise could be much simpler, such as using > deriv() or deriv3() to generate functions, for example to use as an nls model. The nlsr package allows you to specify derivatives. Duncan Murdoch ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
