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


+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