added customizable options for constructor.

Author: matthias.thimm

org-tweetyproject-arg-rankings/src/main/java/org/tweetyproject/arg/rankings/reasoner/StrategyBasedRankingReasoner.java

@@ -122,8 +122,7 @@ public double computeStrengthOfArgument(Argument a, DungTheory kb, Set<Set<Argum
 		/*
 		 * Solve problem with simplex algorithm
 		 */
-		ApacheCommonsSimplex solver = new ApacheCommonsSimplex();
-		solver.onlyPositive = true;
+		ApacheCommonsSimplex solver = new ApacheCommonsSimplex(true);
 		try {
 			Map<Variable, Term> solution = solver.solve(problem);
 			return solution.get(targetVar).doubleValue();

org-tweetyproject-math/src/main/java/org/tweetyproject/math/opt/solver/ApacheCommonsSimplex.java

@@ -75,6 +75,13 @@ public ApacheCommonsSimplex() {
 		this(0.01);
 	}
 
+	/** Constructor 
+	 * @param precision  Whether only positive solutions are allowed.
+	 */
+	public ApacheCommonsSimplex(boolean restrictToNonNegative) {
+		this(50000,0.01,restrictToNonNegative);
+	}
+	
 	/** Constructor 
 	 * @param precision The precision
 	 */