[ALPS-users] diagonal correlations

Tue Feb 7 17:04:53 CET 2017

Yes, it is intended when I attached it, so it can be changed. When i run
the script, I put the filepath, but I still get the x = [0], y = [0]
result. Can I see what's the result when you run the script? Thank you for
the help.

On Tue, Feb 7, 2017 at 6:53 PM, Julien <julien.despres at institutoptique.fr>
wrote:

> yes, there is no path ...
>
> Julien
>
> On 07/02/2017 09:53, Robertson Esperanza wrote:
>
> the line where I put the file path of the xml file (i.e. 'MODEL_LIBRARY':)
> ?
>
> On Tue, Feb 7, 2017 at 4:04 PM, Julien <julien.despres at institutoptique.fr>
> wrote:
>
>> I tested your file after modifying this line. It works
>> On 07/02/2017 09:01, Julien wrote:
>>
>> Hi,
>>
>> there is a little problem in your python script; have a look to the line
>> where you include the xml file for the models.
>>
>> Julien
>>
>> -
>> __________________________________
>>
>> DESPRES Julien
>> Ph.D. student
>>
>> Center for Theoretical Physics
>> Quantum Matter Theory team
>> Ecole Polytechnique
>> 91128 Palaiseau Cedex
>> France, EU
>> Office : 00.10.06 (ground floor)
>> Phone : +33 1 64 33 42 81 <+33%201%2064%2033%2042%2081>
>>
>> Laboratoire Charles Fabry
>> Atom Optics group
>> Institut d'Optique Graduate School
>> 2 Avenue Augustin Fresnel
>> 91127 Palaiseau Cedex
>> France, EU
>> Office : R2.29 (1st floor)
>> Phone: +33 1 64 53 33 49 <+33%201%2064%2053%2033%2049>
>> __________________________________
>>
>> On 07/02/2017 04:24, Robertson Esperanza wrote:
>>
>> I tried to print the result of taking the local measurement for n_i^2 but
>> it only shows
>> x = [0], y = [0], instead of x = [0 1 2 3 4 5 6 7 8 9], y = [10 scalar
>> values] (since i'm using a 10-site open chain). I attached my python script
>> and mymodels.xml. Thank you for the help.
>> On Mon, Feb 6, 2017 at 4:29 PM, Julien <julien.despres at institutoptique.fr
>> > wrote:
>>>
>>> Hi,
>>>
>>> you can do it in this way but in your parameter file you have to write :
>>>
>>> model['MODEL_LIBRARY'] = 'my_own_models.xml'
>>> or you can put it wherever you want but in this case :
>>> model['MODEL_LIBRARY'] = 'path_to_the_xml_file' Julien
>>> On 06/02/2017 09:21, Robertson Esperanza wrote:
>>>
>>> When creating a new model file, is it necessary that the new model file
>>> be saved on the same folder of the default models.xml file?
>>> On Mon, Feb 6, 2017 at 3:55 PM, Michele Dolfi <dolfim at phys.ethz.ch>
>>> wrote:
>>>>
>>>> MEASURE_AVERAGE is compute the average among all sites, i.e. a scalar
>>>> value.
>>>> MEASURE_LOCAL returns a list of measurements on all sites.
>>>> Best,
>>>> Michele
>>>> --
>>>> ETH Zurich
>>>> Dr. Michele Dolfi
>>>> Institute for Theoretical Physics
>>>> HIT G 32.4
>>>> Wolfgang-Pauli-Str. 27
>>>> 8093 Zurich
>>>> Switzerland
>>>> dolfim at phys.ethz.ch
>>>> www.itp.phys.ethz.ch
>>>> +41 44 633 78 56 <+41%2044%20633%2078%2056> phone
>>>> +41 44 633 11 15 <+41%2044%20633%2011%2015> fax
>>>>
>>>> On 6 Feb 2017, at 08:50, Robertson Esperanza <
>>>> robbie.esperanza at gmail.com> wrote:
>>>> Oh, I forgot to mention that I'm using mps_optim application. How does
>>>> the result of MEASURE_AVERAGE differ from MEASURE_LOCAL, if let's say I use
>>>> "n" for these parameters? Thanks
>>>> On Mon, Feb 6, 2017 at 3:08 PM, Michele Dolfi <dolfim at phys.ethz.ch>
>>>> wrote:
>>>>>
>>>>> Hello,
>>>>> Could you please be a bit more specific about the application you are
>>>>> running?
>>>>> You are right about the local measurement, but you need MEASURE_LOCAL,
>>>>> since you want to value at each site. Since the n_i^2 operator is not yet
>>>>> defined in the model library, you need to add it yourself. Basically I
>>>>> would do as follow:
>>>>> 1. Copy the file models.xml from ALPS_ROOT/lib/xml/models.xml, where
>>>>> ALPS_ROOT is the root location of your alps installation.
>>>>> 2. Add this definition to your local copy, it defines the n^2 operator
>>>>> <SITEOPERATOR name=“n_squared" site="x">   n(x)*n(x) </SITEOPERATOR>
>>>>> 3. In your input parameters you have now to link to your new model
>>>>> file.
>>>>> MODEL_LIBRARY=“path/to/models.xml”
>>>>> 4. And add your measurement
>>>>> MEASURE_LOCAL[Density^2] = “ n_squared"
>>>>> Hope this helps.
>>>>> Best,
>>>>> Michele
>>>>> --
>>>>> ETH Zurich
>>>>> Dr. Michele Dolfi
>>>>> Institute for Theoretical Physics
>>>>> HIT G 32.4
>>>>> Wolfgang-Pauli-Str. 27
>>>>> 8093 Zurich
>>>>> Switzerland
>>>>> dolfim at phys.ethz.ch
>>>>> www.itp.phys.ethz.ch
>>>>> +41 44 633 78 56 <+41%2044%20633%2078%2056> phone
>>>>> +41 44 633 11 15 <+41%2044%20633%2011%2015> fax
>>>>>
>>>>> On 6 Feb 2017, at 07:26, Robertson Esperanza <
>>>>> robbie.esperanza at gmail.com> wrote:
>>>>> Hello, I only started studying many-body physics, so there might be
>>>>> gaps in my knowledge. When using the MEASURE_CORRELATION, why does the
>>>>> measurement goes for only site i<j, is it because there will be "blowing
>>>>> up"? Alternatively, to measure for i=j, i think I could use
>>>>> MEASURE_AVERAGE, of let's say (n_i)^2 where n - n_up + n_down. How could I
>>>>> define such measurement, where you use an operator successively? Thank you
>>>>> for replying
>>>>> Robertson Esperanza
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>>> --
>>> __________________________________
>>>
>>> DESPRES Julien
>>> Ph.D. student
>>>
>>> Center for Theoretical Physics
>>> Quantum Matter Theory team
>>> Ecole Polytechnique
>>> 91128 Palaiseau Cedex
>>> France, EU
>>> Office : 00.10.06 (ground floor)
>>> Phone : +33 1 64 33 42 81 <+33%201%2064%2033%2042%2081>
>>>
>>> Laboratoire Charles Fabry
>>> Atom Optics group
>>> Institut d'Optique Graduate School
>>> 2 Avenue Augustin Fresnel
>>> 91127 Palaiseau Cedex
>>> France, EU
>>> Office : R2.29 (1st floor)
>>> Phone: +33 1 64 53 33 49 <+33%201%2064%2053%2033%2049>
>>> __________________________________
>>>
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>>
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>> --
>> __________________________________
>>
>> DESPRES Julien
>> Ph.D. student
>>
>> Center for Theoretical Physics
>> Quantum Matter Theory team
>> Ecole Polytechnique
>> 91128 Palaiseau Cedex
>> France, EU
>> Office : 00.10.06 (ground floor)
>> Phone : +33 1 64 33 42 81 <+33%201%2064%2033%2042%2081>
>>
>> Laboratoire Charles Fabry
>> Atom Optics group
>> Institut d'Optique Graduate School
>> 2 Avenue Augustin Fresnel
>> 91127 Palaiseau Cedex
>> France, EU
>> Office : R2.29 (1st floor)
>> Phone: +33 1 64 53 33 49 <+33%201%2064%2053%2033%2049>
>> __________________________________
>>
>> ---- Comp-phys-alps-users Mailing List for the ALPS Project
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> --
> __________________________________
>
> DESPRES Julien
> Ph.D. student
>
> Center for Theoretical Physics
> Quantum Matter Theory team
> Ecole Polytechnique
> 91128 Palaiseau Cedex
> France, EU
> Office : 00.10.06 (ground floor)
> Phone : +33 1 64 33 42 81 <+33%201%2064%2033%2042%2081>
>
> Laboratoire Charles Fabry
> Atom Optics group
> Institut d'Optique Graduate School
> 2 Avenue Augustin Fresnel
> 91127 Palaiseau Cedex
> France, EU
> Office : R2.29 (1st floor)
> Phone: +33 1 64 53 33 49
> __________________________________
>
>
>
>
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