Did you set the parameter COMPLEX to true to enable complex valued models? On Oct 29, 2012, at 12:18 PM, Forwordom <mljphy@qq.com> wrote:

Hi But I get the error message " Cannot evaluate I" using Sy=1/2/I*(Splus-Sminus) in models.xml and stop finally. What's the matter?' Do I need to edit/modify other items in models.xml or the running python or parameter file ?

------------------ *********************************** 湘潭大学材料与光电物理学院 孟利军 Lijun Meng 邮 箱：mljphy@qq.com 电 话：0731-58298612 地 址：中国、湖南省、湘潭市、湘潭大学 邮 编：411105 ***********************************

------------------ Original ------------------ From: "comp-phys-alps-users-request"<comp-phys-alps-users-request@lists.phys.ethz.ch>; Date: Mon, Oct 29, 2012 07:00 PM To: "comp-phys-alps-users"<comp-phys-alps-users@lists.phys.ethz.ch>; Subject: Comp-phys-alps-users Digest, Vol 79, Issue 6

Send Comp-phys-alps-users mailing list submissions to comp-phys-alps-users@lists.phys.ethz.ch

To subscribe or unsubscribe via the World Wide Web, visit https://lists.phys.ethz.ch/listinfo/comp-phys-alps-users or, via email, send a message with subject or body 'help' to comp-phys-alps-users-request@lists.phys.ethz.ch

You can reach the person managing the list at comp-phys-alps-users-owner@lists.phys.ethz.ch

When replying, please edit your Subject line so it is more specific than "Re: Contents of Comp-phys-alps-users digest..."

Today's Topics:

1. Edit Complex number (=?gb18030?B?Rm9yd29yZG9t?=) 2. Re: Edit Complex number (Matthias Troyer)

----------------------------------------------------------------------

Message: 1 Date: Sun, 28 Oct 2012 21:16:00 +0800 From: "=?gb18030?B?Rm9yd29yZG9t?=" <mljphy@qq.com> To: "=?gb18030?B?Y29tcC1waHlzLWFscHMtdXNlcnM=?=" <comp-phys-alps-users@lists.phys.ethz.ch> Subject: [ALPS-users] Edit Complex number Message-ID: <tencent_07D14DF17BBD218328D27AF4@qq.com> Content-Type: text/plain; charset="gb18030"

Hi alps users and developers I want to simulate a lattice phase transition in external magnetic along x,y,z direction by using dmrg.I have to couple site operator with external magnetic field. But how to edit a complex number in the ALPS models.xml to get site operator Sy=1/2i(Splus-Sminus). Thanks in advance for your reply.