I'm affraid you can't work with complex numbers, yet. Probably next version will, we are working on it.

zhian asadzadeh wrote:

Hi Dear,

Thank you very much for your consideration. yes my model mixes states with different Sz. let me know DMRG works with complex vectors or not? and Can I change the basis which DMRG works in it?

Thanks a lot Mohammad.

On Sun, Mar 1, 2009 at 2:30 PM, <comp-phys-alps-users-request@phys.ethz.ch mailto:comp-phys-alps-users-request@phys.ethz.ch> wrote:

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Today's Topics:

  1. Operator definition (zhian asadzadeh)
  2. Re: Operator definition (Adrian E. Feiguin)


----------------------------------------------------------------------

Message: 1
Date: Sat, 28 Feb 2009 15:11:34 +0330
From: zhian asadzadeh <zhian.asadzadeh@gmail.com
<mailto:zhian.asadzadeh@gmail.com>>
Subject: [ALPS-users] Operator definition
To: comp-phys-alps-users@phys.ethz.ch
<mailto:comp-phys-alps-users@phys.ethz.ch>
Message-ID:

 <89e5d6760902280341r7ca16b5fm506e562c4f043c64@mail.gmail.com
<mailto:89e5d6760902280341r7ca16b5fm506e562c4f043c64@mail.gmail.com>>
Content-Type: text/plain; charset="iso-8859-1"

Hi  All,

I am using DMRG for my problem,  I need to calculate expectation
value of Y
component of Spin operator (Sy) , As a result, I need to define it
in the
model.xml file. How I can define it? I tried with
Sy(i)=1/(2*sqrt(-1))*(Splus(i)-Sminus(i)), but I got  incorrect
results. I
will be very appreciate if someone could help me?

Thank you very much,
Mohammad.