Re: [Rd] DBLEPR?

From: Prof. John C Nash <nashjc_at_uottawa.ca>
Date: Tue, 16 Nov 2010 17:06:08 -0500

We've tried to contact Stig since July. Possibly he changed emails.

My thought was to use Rprintf as suggested and was looking into doing that to see if our optimx problems would go away. Will keep it as open issue while we give a bit more time for response, and welcome input from others.

JN

On 11/16/2010 04:52 PM, Douglas Bates wrote:
> On Tue, Nov 16, 2010 at 2:35 PM, Prof. John C Nash <nashjc@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.


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