>> 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. >
If iterative methods are appropriate, it's perhaps worth pointing out that Newton-Rapheson works nicely for complex functions. The "elliptic" package includes function newton.rapheson() for this, in addition to other utilities for analyzing complex functions. HTH -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
