Are you sure to have installed, not only compiled the new version? I’m attaching my test parameters, both input and output. As you see it manages to reproduce the expected density distribution. Michele -- ETH Zurich Michele Dolfi Institute for Theoretical Physics HIT G 32.4 Wolfgang-Pauli-Str. 27 8093 Zurich Switzerland dolfim@phys.ethz.ch www.itp.phys.ethz.ch +41 44 633 78 56 phone +41 44 633 11 15 fax

On 28 Jul 2015, at 17:44, Dominique Delande <Dominique.Delande@lkb.upmc.fr> wrote:

Dear Michele,

Thanks for your help. I installed the latest trunk version 7593 (I had 7592). Sorry for my stupid mistake, I changed of course to "inhomogeneous chain lattice". sparsediag and fulldiag are working. But, unfortunately, mps_optim still produces the error message:

Exception thrown: Cannot evaluate x

Best regards

Dominique

...

Dear Dominique,

The problem in the MPS codes has been fixed in revision 7593. Just upgrade to the latest /trunk version to get the fix.

Thanks a lot for reporting it. During the implementation we forgot about inhomogeneous lattices.

Note that your parameters seem to work with the sparsediag application, once one actually specifies an inhomogeneous lattice. In your XML parameters you specified the conventional ?open chain lattice?.

Best regards, Michele

-- Dominique Delande (Dominique.Delande@lkb.upmc.fr) Laboratoire Kastler-Brossel - Case 74 - Universite P. et M. Curie 4, place Jussieu, F-75252 Paris Cedex 05, FRANCE Phone : +33 1 44 27 27 97 - Fax : +33 1 44 27 38 45 Acces : Tour 13, Couloir 12-13, 3eme etage - Bureau 316