I am trying to do local measurements on a DMRG state, and thought of using (using Python):
parms[0]['MEASURE_LOCAL_AT[n_0]'] = "n|(0)"
In this case the operator "n" should have support only on the sites labeled by even integers, but the DMRG run does not return any output. Trying 'MEASURE_LOCAL' of course returns something like "operator n not recognized" since it does not work for odd sites. Is the output not supposed to be included with "pyalps.loadEigenstateMeasurements()"?
Is there a way to measure local properties (and correlation functions) between even sites only?
Can (and should) operators be defined on the unit cell as well as the sites?
/Axel Gagge
I don't really get what you are trying to do, could you attach some input file? Are you using the dmrg application or mps_optim?
Best, Michele
On 2017-02-21 13:21, Axel Gagge wrote:
I am trying to do local measurements on a DMRG state, and thought of using (using Python):
parms[0]['MEASURE_LOCAL_AT[n_0]'] = "n|(0)"
In this case the operator "n" should have support only on the sites labeled by even integers, but the DMRG run does not return any output. Trying 'MEASURE_LOCAL' of course returns something like "operator n not recognized" since it does not work for odd sites. Is the output not supposed to be included with "pyalps.loadEigenstateMeasurements()"?
Is there a way to measure local properties (and correlation functions) between even sites only?
Can (and should) operators be defined on the unit cell as well as the sites?
/Axel Gagge
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I attached the input/output XML file. I am using the DMRG application. I am trying to measure a local expectation value which is only defined on one of the two cells in the unit cell. Also, I can't seem to get out the energy variance or entropy at all, maybe I'm not specifying it in a correct way.
Many thanks, Axel
________________________________________ Från: Comp-phys-alps-users comp-phys-alps-users-bounces@lists.phys.ethz.ch för Michele Dolfi dolfim@phys.ethz.ch Skickat: den 21 februari 2017 17:48 Till: comp-phys-alps-users@lists.phys.ethz.ch Ämne: Re: [ALPS-users] Local measurements in ALPS
I don't really get what you are trying to do, could you attach some input file? Are you using the dmrg application or mps_optim?
Best, Michele
On 2017-02-21 13:21, Axel Gagge wrote:
I am trying to do local measurements on a DMRG state, and thought of using (using Python):
parms[0]['MEASURE_LOCAL_AT[n_0]'] = "n|(0)"
In this case the operator "n" should have support only on the sites labeled by even integers, but the DMRG run does not return any output. Trying 'MEASURE_LOCAL' of course returns something like "operator n not recognized" since it does not work for odd sites. Is the output not supposed to be included with "pyalps.loadEigenstateMeasurements()"?
Is there a way to measure local properties (and correlation functions) between even sites only?
Can (and should) operators be defined on the unit cell as well as the sites?
/Axel Gagge
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-- 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
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If there is any more information I can provide to make the problem more clearly formulated? I am looking to measure the operator "n" after a DMRG calculation (mps_optim).
'n' is defined on sites labeled by even integers, and I expected the command 'MEASURE_LOCAL_AT' to work for measuring local expectation values.
I am adding the following to my parameter file as of the moment:
parms[0]['MEASURE_LOCAL_AT[n_0]'] = "n|(0)"
I include the relevant files I can think of. If you are working on the issue or if I have failed to provide enough information, I apologize.
Many thanks, /Axel
________________________________________ Från: Comp-phys-alps-users comp-phys-alps-users-bounces@lists.phys.ethz.ch för Axel Gagge axel.gagge@fysik.su.se Skickat: den 21 februari 2017 18:56 Till: comp-phys-alps-users@lists.phys.ethz.ch Ämne: Re: [ALPS-users] Local measurements in ALPS
I attached the input/output XML file. I am using the DMRG application. I am trying to measure a local expectation value which is only defined on one of the two cells in the unit cell. Also, I can't seem to get out the energy variance or entropy at all, maybe I'm not specifying it in a correct way.
Many thanks, Axel
________________________________________ Från: Comp-phys-alps-users comp-phys-alps-users-bounces@lists.phys.ethz.ch för Michele Dolfi dolfim@phys.ethz.ch Skickat: den 21 februari 2017 17:48 Till: comp-phys-alps-users@lists.phys.ethz.ch Ämne: Re: [ALPS-users] Local measurements in ALPS
I don't really get what you are trying to do, could you attach some input file? Are you using the dmrg application or mps_optim?
Best, Michele
On 2017-02-21 13:21, Axel Gagge wrote:
I am trying to do local measurements on a DMRG state, and thought of using (using Python):
parms[0]['MEASURE_LOCAL_AT[n_0]'] = "n|(0)"
In this case the operator "n" should have support only on the sites labeled by even integers, but the DMRG run does not return any output. Trying 'MEASURE_LOCAL' of course returns something like "operator n not recognized" since it does not work for odd sites. Is the output not supposed to be included with "pyalps.loadEigenstateMeasurements()"?
Is there a way to measure local properties (and correlation functions) between even sites only?
Can (and should) operators be defined on the unit cell as well as the sites?
/Axel Gagge
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-- 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
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