[Rd] nlminb with constraints failing on some platforms

[Berend Hasselman]

> On 6 Feb 2019, at 10:58, Martin Maechler <maechler using stat.math.ethz.ch> wrote:
> 

.....
> ---------------------------------------------------------------------------
> 
> I summarize what has been reported till:
> 
> Failure in these cases
> ========
> 1. Kasper K ("Scientific Linux", self compiled R, using Intel's MKL
>  	    for BLAS/LAPACK)
> 2. (By Bill Dunlap): Microsoft R Open (MRO) 3.4.2, also using
>  	    MKL with 12 cores
> 3. (By Brad Bell)  : R 3.5.2 Fedora 28 (x86_64) pkg, OpenBLAS(?)
> 4. (by MM)         : R 3.5.2 Fedora 28 (x86_64) pkg, BLAS+Lapack = OpenBLAS
> 
> Success
> =======
> 
> - (by MM)	   : R-devel, R 3.5.2 patched on FC28, *self compiled* gcc 8.2,
>      		     using R's BLAS/Lapack 
> - (by Ralf Stubner): R 3.5.2 from Debian Stable (gcc 6.2) + OpenBLAS
> - (by Berend H.)   : R 3.5.2 [from CRAN] on macOS 10.14.3 (BLAS/Lapack ??)

R 3.5.2 from CRAN using R's BLAS/Lapack.

Berend

....

> It would be great if this could be solved...
> 
> Martin
> 
> 
> 	
>> I have tried passing in the gradient and turning on the trace and it gives nearly the exact same trace with and without the gradient.
>    [.......................]
> 
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