R help - Apr 2007 - Find zeros of analytic functions

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


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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 
knowledge.
> - 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