communityattachment's Introduction
Random generators of SAT instances: - Classical Random k-CNF - Community Attachment (formulas with modularity) %%%%%%%%%%%%%%%%%%%%%%%%%%%%% 1. Compile: $ make 2. Usage: $ ./random -n <variables> -m <clauses> -k <clauseLength> -s <seed> $ ./commAttach -n <variables> -m <clauses> -k <clauseLength> -c <communities> -Q <modularity> -s <seed> %%%%%%%%%%%%%%%%%%%%%%%%%%%%% A small script for computing the number of satisfiable/unsatisfiable instances across a range of clause/variable ratios (for a fixed number of variables): # Fix the number of variables: n=100; k=3; for ratio in `seq 3.5 0.1 4.5`;do m=$(echo "scale=0; $n*$ratio/1.0"|bc); # Counters SAT and UNSAT: let sat=0; let unsat=0; # For every value, generate 20 random formulas with distinct seeds for seed in {1..20};do # "glucose" is a path to a SAT solver: # for instance: https://www.labri.fr/perso/lsimon/downloads/softwares/glucose-syrup-4.1.tgz isunsat=$(./random -k $k -n $n -m $m -s $seed | glucose | grep "^s UNSAT" | wc -l | awk '{print($1)}'); # The previous step explicitely: # CNF=random_${k}_${n}_${m}_${s}.cnf # ./random -n $n -m $m -s $seed > $CNF # glucose $CNF > $CNF.glucose.out # isunsat=$(grep "^s UNSAT" $CNF.glucose.out | wc -l | awk '{print($1)}') # Count if [ $isunsat == 1 ];then let unsat=$unsat+1; else let sat=$sat+1; fi; done; echo $n $m $sat $unsat; done
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