Re: [Rd] DBLEPR?

From: Douglas Bates <bates_at_stat.wisc.edu>
Date: Tue, 16 Nov 2010 15:52:06 -0600

On Tue, Nov 16, 2010 at 2:35 PM, Prof. John C Nash <nashjc_at_uottawa.ca> wrote:
> I normally see digest once per day, but got msg from Doug Bates so responding with context.

> UCMINF is a package on CRAN that implements a variable metric minimizer.

A pedant might point out that the package is called "ucminf".

> It does quite
> well on unconstrained problems. Stig Mortensen packaged the Fortran version for R, but is
> not at moment responding to emails. There's also a Matlab version. We have it in optimx
> and get some occasions where it just stops if we set trace>0. Other times we can't get it
> to fail. My guess is something like an undefined variable or a bad declaration of a
> pointer, but C and C++ are not languages I've much experience with.

Well, it doesn't work well for me because my version of gfortran (GNU Fortran (Ubuntu/Linaro 4.4.4-14ubuntu5) 4.4.5) objects to the format strings in some of the Fortran WRITE statements.

The recommended approach is to avoid all Fortran I/O including writing to a Fortran character array. As there are only 3 such WRITE statements in the Fortran code it would be very simple to replace them with calls to C functions that in turn call Rprintf. However, it would be best if Stig could take ownership of the modifications.



R-devel_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel Received on Tue 16 Nov 2010 - 21:54:35 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Wed 17 Nov 2010 - 01:40:22 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-devel. Please read the posting guide before posting to the list.

list of date sections of archive