Hi, Matthias,

Since you said sparsediag was the code to use, then how to set the number of eignstates to calculate in the parameter file or command line? I can not find the answer in the turtorials.

Bo-Nan

bonanjiang@gmail.com

From: comp-phys-alps-users-request Date: 2014-08-26 18:00 To: comp-phys-alps-users Subject: Comp-phys-alps-users Digest, Vol 101, Issue 14 Send Comp-phys-alps-users mailing list submissions to comp-phys-alps-users@lists.phys.ethz.ch

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Today's Topics:

1. Help with LiveALPS (Niraj Ghimire) 2. a question about fulldiag (bonanjiang@gmail.com) 3. Re: a question about fulldiag (Matthias Troyer)

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Message: 1 Date: Mon, 25 Aug 2014 12:08:57 -0400 From: Niraj Ghimire niraj.ghimire@gmail.com To: "comp-phys-alps-users@lists.comp-phys.org" comp-phys-alps-users@lists.comp-phys.org Subject: [ALPS-users] Help with LiveALPS Message-ID: CACMdJOXGtHsttzbF-+1LLxL3OmvdnntrTvcQjiJ9fsCXUGk1jQ@mail.gmail.com Content-Type: text/plain; charset="utf-8"

Dear ALPS users, I have been running LiveALPS from my USB flash drive and I can't get access to the internet. I could not find any information anywhere on how to resolve this issue. Would you be able to help me out ?

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Message: 2 Date: Tue, 26 Aug 2014 14:41:48 +0800 From: "bonanjiang@gmail.com" bonanjiang@gmail.com To: comp-phys-alps-users comp-phys-alps-users@lists.phys.ethz.ch Subject: [ALPS-users] a question about fulldiag Message-ID: 201408261441449660406@gmail.com Content-Type: text/plain; charset="us-ascii"

Hi, all I currently tend to calculate the energy of the lowest 4 states of a fermion system with fulldiag of ALPS. However, since the system has 12 eigenstates in total and fulldiag gives all of them, the time it takes is a little bit long. So, my question is: is there any way to limit the number of eigenstates that fulldiag calculates? for example, the lowest 4 states.

Bo-Nan

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Message: 3 Date: Tue, 26 Aug 2014 08:56:54 +0200 From: Matthias Troyer troyer@phys.ethz.ch To: "comp-phys-alps-users@lists.phys.ethz.ch" comp-phys-alps-users@lists.phys.ethz.ch Subject: Re: [ALPS-users] a question about fulldiag Message-ID: 362E955B-595C-4AE6-A412-27EA6F8EEA63@phys.ethz.ch Content-Type: text/plain; charset="us-ascii"

sparsediag is the code to use in this case

On Aug 26, 2014, at 8:41, "bonanjiang@gmail.com" bonanjiang@gmail.com wrote:

Hi, all I currently tend to calculate the energy of the lowest 4 states of a fermion system with fulldiag of ALPS. However, since the system has 12 eigenstates in total and fulldiag gives all of them, the time it takes is a little bit long. So, my question is: is there any way to limit the number of eigenstates that fulldiag calculates? for example, the lowest 4 states.

Bo-Nan bonanjiang@gmail.com

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