/* This file is part of libDAI - http://www.libdai.org/
*
* libDAI is licensed under the terms of the GNU General Public License version
* 2, or (at your option) any later version. libDAI is distributed without any
* warranty. See the file COPYING for more details.
*
* Copyright (C) 2008-2009 Joris Mooij [joris dot mooij at libdai dot org]
*/
#include
#include
#include
using namespace std;
using namespace dai;
int main() {
Var x0(0, 2); // Define binary variable x0 (with label 0)
Var x1(1, 3); // Define ternary variable x1 (with label 1)
// Define set X = {x0, x1}
VarSet X; // empty
X |= x1; // X = {x1}
X |= x0; // X = {x1, x0}
cout << "X = " << X << endl << endl; // Note that the elements of X are ordered according to their labels
// Output some information about x0, x1 and X
cout << "Var " << x0 << " has " << x0.states() << " states (possible values)." << endl;
cout << "Var " << x1 << " has " << x1.states() << " states." << endl << endl;
cout << "VarSet " << X << " has " << X.nrStates() << " states (joint assignments of its variables)." << endl << endl;
cout << "States of VarSets correspond to states of their constituent Vars:" << endl;
cout << " state of x0: state of x1: (linear) state of X:" << endl;
for( size_t s1 = 0; s1 < x1.states(); s1++ ) // for all states s1 of x1
for( size_t s0 = 0; s0 < x0.states(); s0++ ) { // for all states s0 of x0
// store s0 and s1 in a map "states"
map` states;
states[x0] = s0;
states[x1] = s1;
// output states of x0, x1 and corresponding state of X
cout << " " << s0 << " " << s1 << " " << X.calcState(states) << endl;
// VarSet::calcStates is the inverse of VarSet::calcState
DAI_ASSERT( X.calcStates(X.calcState(states)) == states );
}
cout << endl << "And vice versa:" << endl;
cout << " state of x0: state of x1: (linear) state of X:" << endl;
for( size_t S = 0; S < X.nrStates(); S++ ) { // for all (joint) states of X
// calculate states of x0 and x1 corresponding to state S of X
map`` states = X.calcStates(S);
// output state of X and corresponding states of x0, x1
cout << " " << states[x0] << " " << states[x1] << " " << S << endl;
// VarSet::calcState is the inverse of VarSet::calcStates
DAI_ASSERT( X.calcState(X.calcStates(S)) == S );
}
cout << endl << "Iterating over all joint states using the State class:" << endl;
cout << " state of x0: state of x1: (linear) state of X: state of X (as a map):" << endl;
for( State S(X); S.valid(); S++ ) {
// output state of X and corresponding states of x0, x1
cout << " " << S(x0) << " " << S(x1) << " " << S << " " << S.get() << endl;
}
return 0;
}
`