Dear Xinbo Wei, The mps codes we implemented require operators at different sites. To measure the missing operators you can use the MEASURE_LOCAL_AT parameters, for example: MODEL_LIBRARY="mymodels.xml" MEASURE_LOCAL_AT[Custom meas] = "cdag_up:cdag_down__c_up:c_down|(0,1,2)” where cdag_down__c_up has been previously defined in mymodels.xml as <SITEOPERATOR name="cdag_down__c_up" site="x"> cdag_down(x)*c_up(x) </SITEOPERATOR> If you need all combinations of sites i,j,k, you can use MEASURE_HALF_CORRELATIONS[Custom corr] = "cdag_up:cdag_down__c_up:c_down" Best regards, 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 Jan 6, 2016, at 6:41 AM, 北尘心 <740572900@qq.com> wrote:

Hi, I want to measure corrections by mps code.I use the command like MEASURE_HALF_NN_CORRELATIONS[A]="cdag_up:cdag_down:c_up:c_down". but it unable to calculate the following situtation: "cdag_up:cdag_down:c_up:c_down|(0,1,1,2)".How can i acheieve it? Thank you very much if you could give me any advice .

Best, Xinbo Wei