[R] Find zeros of analytic functions

Prof Brian Ripley ripley at stats.ox.ac.uk
Mon Apr 16 13:24:09 CEST 2007

There is no need to send this twice under different subject lines.

On Mon, 16 Apr 2007, enrico.foscolo2 wrote:

> Dear Partecipants to the list,

> I am Enrico Foscolo, a student of the Faculty of Statistics, University of Bologna,
> and I am interested under consideration of the search of zeros of one function.
> I would want to write a code using the software R.
> I have already read the book "Computing the Zeros of Analytic Functions" (P. Kravanja and M. Van Barel, 2000) that speaks about this problem, computing a Fortran 90 code.
> Consequently, I would want to ask You if:
> - already exists a R code,

I presume you mean analytic functions of a complex argument.  Few R 
packages use complex vectors, and none of those few do this to my 

> - how can I recall a Fortran 90 function in R (Windows XP Operating System).

This is covered in 'Writing R Extensions', section 1.2.3 in the version 
(2.5.0 beta) I looked at.

> My aim is to write the code for complete my work about studying functions and
> searching points of maximum and minimum (local and global).
> Many thanks for any kind of help and for Your availability.
> Enrico Foscolo

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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