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/*
assignment problem by simulated annealing.
*/
#include "wnlib.h"
#include "wnswap.h"
#include "wnabs.h"
#include "wnmat.h"
#define SIZE 200
/*
#define SIZE 50
*/
local int *permutation;
local double objective,**matrix;
main()
{
wn_gpmake("no_free");
initialize();
printf("size = %d\n",SIZE);
printf("start objective = %f\n",objective);
solve();
printf("end objective = %f\n",objective);
wn_gpfree();
}
local initialize()
{
extern double wn_flat_distribution();
int i,j;
wn_make_raw_matrix(&matrix,SIZE,SIZE);
permutation = (int *)wn_zalloc(SIZE*wn_sizeof(int));
wn_random_permutation(permutation,SIZE);
for(i=0;i<SIZE;++i)
{
for(j=0;j<SIZE;++j)
{
matrix[i][j] = wn_flat_distribution();
}
}
objective = 0;
for(i=0;i<SIZE;++i)
{
objective += matrix[i][permutation[i]];
}
}
/*
#define TIME 20000000000.0
#define TIME 10000000000.0
#define TIME 1800000000.0
#define TIME 360000000.0
#define TIME 1000000.0
*/
#define TIME 10000000000.0
local solve()
{
double delta_of_mutation(),temperature_function();
void accept_mutation();
double temperature;
printf("time = %f\n",(float)TIME);
wn_measure_anneal_temperature(&temperature,(delta_of_mutation),10000.0);
printf("temperature = %f\n",(float)temperature);
wn_anneal(
(delta_of_mutation),(accept_mutation),
(temperature_function),
TIME);
wn_measure_anneal_temperature(&temperature,(delta_of_mutation),10000.0);
printf("temperature = %f\n",(float)temperature);
}
local double temperature_function(time)
double time;
{
/*
return(1.00*wn_anneal_time*time);
return(0.20*wn_anneal_time*time);
return(0.20*wn_anneal_time*time + 0.05);
return(0.05);
*/
return(0.20*time*time);
}
local int index1,index2;
local double delta_score;
local double delta_of_mutation()
{
double eval_num_at_index();
index1 = wn_random_mod_int(SIZE);
index2 = wn_random_mod_int(SIZE);
compute_delta(&delta_score);
return(delta_score);
}
local compute_delta(pdelta_score)
double *pdelta_score;
{
*pdelta_score = matrix[index1][permutation[index2]] +
matrix[index2][permutation[index1]] -
matrix[index1][permutation[index1]] -
matrix[index2][permutation[index2]];
}
local accept_mutation()
{
wn_swap(permutation[index1],permutation[index2],int);
objective += delta_score;
}
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