Comp-phys-alps-users

comp-phys-alps-users@lists.phys.ethz.ch

August 2016

4 participants
2 discussions

question about using alps on mac
by 刘东皓 22 Aug '16

22 Aug '16

I have two questions about using ALPS with python I have two macs with both installed alps from binary packages. When I use the *.py files in tutorials. (1) One shows "Fatal Python error PyThreadState_Get : no current thread" Abort trap :6 (2) The other mac has an error : "ImportError: No module named pymcdata_c" Can anyone help me Thanks -- 刘东皓（Donghao Liu） International Center for Quantum Materials(ICQM) Physics WestBuilding 618 Peking University No. 209 Chengfu Road, Haidian District Beijing, 100871, China

3 2

use MPS to calculate the correlation
by 北尘心 10 Aug '16

10 Aug '16

Dear all, I would like to use MPS to calculate the correlation of four operators .The correlation of four operators like this cdag_up(i):cdag_down(i+1):c_up(i+1):c_down(i+2) I use the following two ways to calculate,but the results of the two methods are opposite. The first method: In model file <SITEOPERATOR name="cdag_down__c_up" site="x"> cdag_down(x)*c_up(x) </SITEOPERATOR> In command file MEASURE_LOCAL_AT[cdag_up:cdag_down:c_up:c_down] = "cdag_up:cdag_down__c_up:c_down|(0,1,2)" another method: In model file <OPERATOR name="ca" matrixelement="1"> <CHANGE quantumnumber="Ndown" change="1"/> <CHANGE quantumnumber="Nup" change="-1"/> </OPERATOR> In command file MEASURE_LOCAL_AT[cdag_up:cdag_down:c_up:c_down] = "cdag_up:ca:c_down|(0,1,2)" I would like to know which method is correct and why the answers are opposite? It is highly grateful for your any suggestions. Yours sincerely, Xingbo Wei Zhejiang Normal Universtiy, Jinhua, 230014, China

1 0