nlminb with constraints failing on some platforms

On 6 Feb 2019, at 10:58, Martin Maechler <maechler at 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.

   [.......................]