June 2013 - Comp-phys-alps-users

Inconsistent comment in generate_spline_matrix in the DMFT folder
by Kuangshing Chen 22 Jul '15

22 Jul '15

Hi, The function generate_spline_matrix in fouriertransform.C in the dmft folder shows the comments as follows: // A is the matrix whose inverse defines spline_matrix // // 6 6 // 1 4 1 // 1 4 1 // A = ... // // 1 4 1 // -2 0 0 2 However, the following codes, dense_matrix A = 4*dt/6.*boost::numeric::ublas::identity_matrix<double>(Np1); for (int i=1; i<Np1-1; i++) { A(i,i-1) = dt/6.; A(i,i+1) = dt/6.; } A(0,0) = 1.; A(0, Np1-1) = 1.; A(Np1-1, 0) = -2.*dt/6.; A(Np1-1, 1) = -1.*dt/6.; A(Np1-1, Np1-2) = 1*dt/6.; A(Np1-1, Np1-1) = 2*dt/6.; the red lines will make the matrix looks like // 6 6 // 1 4 1 // 1 4 1 // A = ... // // 1 4 1 // -2 *-1* *1* 2 Is the comment correct or the code correct? Any reference for this algorithm? Thank you, Kuang-Shing Chen

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disordered models
by Bo-Nan JIANG 27 Jun '13

27 Jun '13

Hi, Matthias Based on my plan, If ALPS works for the disordered system, I would try ED first on the 10 sites system and then DMRG for larger ones. Best, Bo-Nan -- Stay foolish,Stay hungry.

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Running APLS QMC code in canonical ensemble?
by Tao Ying 26 Jun '13

26 Jun '13

Dear ALPS developers and users, I'm using the APLS QMC (dirloop_sse and worm) code in grand canonical ensemble, can I get these two codes running in canonical ensemble? Best, TaoYing -- Tao Ying, Ph.D candidate, Physics department Harbin Institute of Technology

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disordered models
by Bo-Nan JIANG 26 Jun '13

26 Jun '13

Hi, all I am working on the disordered models nowadays, say disordered Fermi-Hubbard model, which is a Fermi-Hubbard model in the random potential. Can ALPS find the ground state of FHM in the random potential for me? Any suggestion is welcome. best, Bo-Nan -- Stay foolish,Stay hungry.

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CT-QMC Code
by Soumen Bag 25 Jun '13

25 Jun '13

Dear Sir, I wanted to look onto the CT-QMC source code. If I build the current version of ALPS, Will it be possible to look onto them? Thanking You, *Soumen Kumar Bag* *Physical Science Dept.* *IISC*

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Problem with
by Tommy Ellqvist 18 Jun '13

18 Jun '13

Hi, I am the maintainer for the VisTrails binaries. I am trying to update the bundled ALPS, but the win64 version found here fails: http://archive.comp-phys.org/software/vistrails/alps-vistrails-2.1.1-win64.… This is the error: packages\pyalps\ngs.py", line 61, in <module> from pyngsobservable_c import createRealObservable #remove this with new ALEA! ImportError: cannot import name createRealObservable Looking at the dates, it looks like some of the files are old. The dates in the win32 binaries are newer, and that binary works. Is the win64 binary broken, or have I made an error somewhere? Thanks, Tommy CRITICAL 2013-06-18 11:19:32,523 C:\Program Files\VisTrails 2.0.3pre\vistrails\core\packagemanager.py, line 531 Initialization of package <codepath alps> failed and will be disabled Package 'ALPS' failed to initialize because of the following exceptions: Traceback (most recent call last): File "C:\Program Files\VisTrails 2.0.3pre\vistrails\core\modules\module_registry.py", line 1434, in initialize_package package.initialize() File "C:\Program Files\VisTrails 2.0.3pre\vistrails\core\modules\package.py", line 402, in initialize __import__(name, globals(), locals(), []) File "C:\Program Files\VisTrails 2.0.3pre\vistrails\core\modules\package.py", line 296, in _import (name, globals, locals, fromlist, level)) File "C:\Program Files\VisTrails 2.0.3pre\vistrails\packages\alps\init.py", line 16, in <module> import alpscore File "C:\Program Files\VisTrails 2.0.3pre\vistrails\core\modules\package.py", line 296, in _import (name, globals, locals, fromlist, level)) File "C:\Program Files\VisTrails 2.0.3pre\vistrails\packages\alps\alpscore.py", line 30, in <module> import pyalps File "C:\Program Files\VisTrails 2.0.3pre\vistrails\core\modules\package.py", line 296, in _import (name, globals, locals, fromlist, level)) File "C:\Program Files\VisTrails 2.0.3pre\vistrails\Python27_64\lib\site-packages\pyalps\__init__.py", line 38, in <module> from tools import * File "C:\Program Files\VisTrails 2.0.3pre\vistrails\core\modules\package.py", line 296, in _import (name, globals, locals, fromlist, level)) File "C:\Program Files\VisTrails 2.0.3pre\vistrails\Python27_64\lib\site-packages\pyalps\tools.py", line 39, in <module> import pyalps.hdf5 as h5 File "C:\Program Files\VisTrails 2.0.3pre\vistrails\core\modules\package.py", line 296, in _import (name, globals, locals, fromlist, level)) File "C:\Program Files\VisTrails 2.0.3pre\vistrails\Python27_64\lib\site-packages\pyalps\hdf5.py", line 33, in <module> from ngs import * File "C:\Program Files\VisTrails 2.0.3pre\vistrails\core\modules\package.py", line 296, in _import (name, globals, locals, fromlist, level)) File "C:\Program Files\VisTrails 2.0.3pre\vistrails\Python27_64\lib\site-packages\pyalps\ngs.py", line 61, in <module> from pyngsobservable_c import createRealObservable #remove this with new ALEA! ImportError: cannot import name createRealObservable

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Problems with ALPS installation
by Menchyshyn Oleh 15 Jun '13

15 Jun '13

Dear ALPS users and developers, I have been struggling for a couple days installing ALPS to realize I cant do it on my own. I am installing ALPS on laptop under Debian Wheezy. Please find below *CMakeError.log* attached. I might be wrong but It seems to me some additional flags should be used when starting *cmake*. Also if ignore the errors and proceed to the next steps, *make test* says 4 test failed. I have attached the extended description on them below. Maybe it will give you some clues on the matter. I will appreciate your kindly help. Best regards, Oleh Menchyshyn

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t-J exact diagonalization (still problems)
by Marco Di Liberto 14 Jun '13

14 Jun '13

Dear Prof. Troyer, in a former post I described some problems that I have found reproducing some results by Ogata et al. on the t-J model; they are still unsolved and I would really need to use the library for a more complicated problem. Briefly, I focus on one single case: N = 4, L = 16. (For N = 2, 6, 10.. things seem to work with periodic bc). The reference suggests to use antiperiodic bc to have the ground state in the zero momentum sector. This should be equivalent (through a canonical transformation) to a system with complex hopping t -> t exp(i \pi / L) and periodic boundary conditions so that I can use the library in the standard way. In the python script I define two hoppings (left and right) phi = Pi/L tr = 'exp(' + str(phi)+'*I)' tl = 'exp(-' + str(phi)+'*I)' I checked for spinless non-interacting fermions with complex hopping that I get the ground state energy correctly both in the case with zero flux and in the case with \pi flux. This can be done analitically and, if I consider an odd number of fermions, I found the correct result in the zero momentum sector for 3 particles in 8 sites and 5 particles in 16 sites. For the t-J with N = 4, L = 16 the ground state that I find is not in the zero momentum sector (E=-7.5655955) but it is in another sector (k = 5.4977871437) and the energy is (E=-7.84743613). Any suggestion? Best, --- Marco Di Liberto PhD Student ITP (Institute for Theoretical Physics) Utrecht University

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