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@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@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

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
__________________________________
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@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@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
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On 6 Feb 2017, at 08:50, Robertson Esperanza <robbie.esperanza@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@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
On 6 Feb 2017, at 07:26, Robertson Esperanza <robbie.esperanza@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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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

Laboratoire Charles Fabry
Atom Optics group
Institut d'Optique Graduate School
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France, EU
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Phone: +33 1 64 53 33 49
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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

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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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

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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