mps-0.0.0
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itebd_expected12_d.cc
1 // -*- mode: c++; fill-column: 80; c-basic-offset: 2; indent-tabs-mode: nil -*-
2 /*
3  Copyright (c) 2012 Juan Jose Garcia Ripoll
4 
5  Tensor is free software; you can redistribute it and/or modify it
6  under the terms of the GNU Library General Public License as published
7  by the Free Software Foundation; either version 2 of the License, or
8  (at your option) any later version.
9 
10  This program is distributed in the hope that it will be useful,
11  but WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  GNU Library General Public License for more details.
14 
15  You should have received a copy of the GNU General Public License along
16  with this program; if not, write to the Free Software Foundation, Inc.,
17  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19 
20 #include <mps/flags.h>
21 #include "slow_expected.hpp"
22 #include "bdry_expected.hpp"
23 #include "canonical_expected.hpp"
24 
25 namespace mps {
26 
27  double expected12(const RiTEBD &psi, const RTensor &Op12, int site)
28  {
30  return do_expected12(psi, Op12, site);
31  } else if (FLAGS.get(MPS_ITEBD_EXPECTED_METHOD) == MPS_ITEBD_SLOW_EXPECTED){
32  return slow_expected12(psi, Op12, site);
33  } else {
34  return bdry_expected12(psi, Op12, site);
35  }
36  }
37 
38 } // namespace mps
39 
const unsigned int MPS_ITEBD_SLOW_EXPECTED
iTEBD expectation values computing powers of transfer matrices.
Definition: flags.cc:59
An infinite Matrix Product State with translational invariance but using two tensors: one for odd and...
Definition: itebd.h:41
double expected12(const RiTEBD &psi, const RTensor &Op12, int site=0)
Expected value of the two-site operator Op12 acting on 'site' and 'site+1'.
const unsigned int MPS_ITEBD_EXPECTED_METHOD
iTEBD expectation value method selector.
Definition: flags.cc:61
const unsigned int MPS_ITEBD_CANONICAL_EXPECTED
iTEBD expectation values assuming canonical form.
Definition: flags.cc:58