Re: cauchy.m in optim package?

[Juan Pablo Carbajal]

On Thu, Jul 24, 2014 at 9:30 AM, Olaf Till <address@hidden> wrote:
> Though I don't completely understand its algorithm, cauchy.m does not
> seem to belong into the optim package for me. AFAICT it computes
> derivatives (even if also those of higher order) only with respect to
> a single parameter. And even the returned first derivatives vary
> vastly with different values for the arguments `N' and `r', as simple
> tests with sin(x) for x=0 show.
>
> Both issues seem to make it fairly useless for optimization. If nobody
> corrects me, I'd suggest to remove it from the optim package.
>
> Olaf
>
> --
> public key id EAFE0591, e.g. on x-hkp://pool.sks-keyservers.net

Hi Olaf,

Her eis the reasoning why we add it there. Basically other functions
to calculate numerical derivatives are already in optim, so if you are
not against those, I wouldn't know why you are against this one there.

http://octave.1599824.n4.nabble.com/Taylor-expansion-using-the-fft-td3885008.html#a3885077