include/dai/x2x.h

   1 /*  Copyright (C) 2006-2008  Joris Mooij  [j dot mooij at science dot ru dot nl]
   2     Radboud University Nijmegen, The Netherlands
   3
   4     This file is part of libDAI.
   5
   6     libDAI is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     libDAI is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with libDAI; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 */
  20
  21
  22 #ifndef __defined_libdai_x2x_h
  23 #define __defined_libdai_x2x_h
  24
  25
  26 #include <cmath>
  27 #include <cstring>
  28
  29
  30 namespace x2x {
  31
  32     // Probability tables store -1 first, then +1
  33
  34     /// Convert moments to cumulants upto order k
  35     void m2c (int N, double *x, int k);
  36
  37     /// Convert cumulants to moments upto order k
  38     void c2m (int N, double *x, int k);
  39
  40     /// Convert (generalized) weights to log probability or energy
  41     void w2logp (int N, double *x);
  42
  43     /// Convert log probability or energy to (generalized) weights
  44     void logp2w (int N, double *x);
  45
  46     /// Convert probability to moments
  47     void p2m (int N, double *x);
  48
  49     /// Convert moments to probability
  50     void m2p (int N, double *x);
  51
  52     /// Convert log probability to probability
  53     void logp2p (int N, double *x);
  54
  55     /// Convert probability to log probability
  56     void p2logp (int N, double *x);
  57
  58     /// Normalize a log probability table
  59     void logpnorm (int N, double *x);
  60
  61     /// Normalize a probability table, use logpnorm whenever possible
  62     void pnorm (int N, double *x);
  63
  64     /// Fills table with v for all entries with more than k indices
  65     /// used for example when cumulants or moments are converted upto some order
  66     void fill (int N, double *x, int k, double v);
  67
  68 } // end of namespace x2x
  69
  70
  71 #endif