Hi, All<br><br>I have come to bfgs crash with error information below when i did relax calculation of graphene system under finite-homogeneous-electric field.  The finite-homogeneous-field is perpendicular to the graphene plane with E=
0.001 a.u..<br>I just want to perform  calculation of static dielectric properties of this 2-D system.<br><pre>"<br>trust_radius < trust_radius_min<br><br>resetting bfgs history<br><br>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%=
<br>%%<br><br>from bfgs : error # 1<br><br>bfgs history already reset at previous step<br><br>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%=<br>%%%%%<br><br>stopping ...<br><br>*************************************************************************=
<br>******</pre>"<br><br>I checked mailing-list several times , and didnot  find  the related solutions, would you  please give me some suggestion and comments ?<br><br>Best Wishes,<br><br>H.P<br><br><br>-- <br>Hai-Ping Lan 
<br>Department of Electronics ,<br>Peking University , Bejing, 100871<br><a href="mailto:lanhaiping@gmail.com">lanhaiping@gmail.com</a>, <a href="mailto:hplan@pku.edu.cn">hplan@pku.edu.cn</a>