Exemplo n.º 1
0
int main(void)
{     glp_prob *P;
      P = glp_create_prob();
      glp_read_mps(P, GLP_MPS_DECK, NULL, "25fv47.mps");
      glp_adv_basis(P, 0);
      glp_simplex(P, NULL);
      glp_print_sol(P, "25fv47.txt");
      glp_delete_prob(P);
      return 0;
}
Exemplo n.º 2
0
int main(void)
{     glp_prob *P;
      glp_smcp parm;
      P = glp_create_prob();
      glp_read_mps(P, GLP_MPS_DECK, NULL, "25fv47.mps");
      glp_init_smcp(&parm);
      parm.meth = GLP_DUAL;
      glp_simplex(P, &parm);
      glp_print_sol(P, "25fv47.txt");
      glp_delete_prob(P);
      return 0;
}
/**
 * Solves the MLP problem
 *
 * @param mlp the MLP Handle
 * @param ctx solution context
 * @return GNUNET_OK if could be solved, GNUNET_SYSERR on failure
 */
int
GAS_mlp_solve_problem (struct GAS_MLP_Handle *mlp, struct GAS_MLP_SolutionContext *ctx)
{
  int res;
  /* Check if solving is already running */
  if (GNUNET_YES == mlp->semaphore)
  {
    if (mlp->mlp_task != GNUNET_SCHEDULER_NO_TASK)
    {
      GNUNET_SCHEDULER_cancel(mlp->mlp_task);
      mlp->mlp_task = GNUNET_SCHEDULER_NO_TASK;
    }
    mlp->mlp_task = GNUNET_SCHEDULER_add_delayed (mlp->exec_interval, &mlp_scheduler, mlp);
    return GNUNET_SYSERR;
  }
  mlp->semaphore = GNUNET_YES;

  mlp->last_execution = GNUNET_TIME_absolute_get ();

  ctx->lp_result = GNUNET_SYSERR;
  ctx->mlp_result = GNUNET_SYSERR;
  ctx->lp_duration = GNUNET_TIME_UNIT_FOREVER_REL;
  ctx->mlp_duration = GNUNET_TIME_UNIT_FOREVER_REL;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Solve LP problem\n");
#if WRITE_MLP
  char * name;
  static int i;
  i++;
  GNUNET_asprintf(&name, "problem_%i", i);
  glp_write_lp (mlp->prob, 0, name);
  GNUNET_free (name);
# endif

  res = mlp_solve_lp_problem (mlp, ctx);
  ctx->lp_result = res;
  if (res != GNUNET_OK)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "LP Problem solving failed\n");
    mlp->semaphore = GNUNET_NO;
    return GNUNET_SYSERR;
  }

#if WRITE_MLP
  GNUNET_asprintf(&name, "problem_%i_lp_solution", i);
  glp_print_sol (mlp->prob,  name);
  GNUNET_free (name);
# endif


  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Solve MLP problem\n");
  res = mlp_solve_mlp_problem (mlp, ctx);
  ctx->mlp_result = res;
  if (res != GNUNET_OK)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "MLP Problem solving failed\n");
    mlp->semaphore = GNUNET_NO;
    return GNUNET_SYSERR;
  }
#if WRITE_MLP
  GNUNET_asprintf(&name, "problem_%i_mlp_solution", i);
  glp_print_mip (mlp->prob, name);
  GNUNET_free (name);
# endif

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Problem solved %s (LP duration %llu / MLP duration %llu)\n",
      (GNUNET_OK == res) ? "successfully" : "failed", ctx->lp_duration.rel_value, ctx->mlp_duration.rel_value);
  /* Process result */
  struct ATS_Peer *p = NULL;
  struct ATS_Address *a = NULL;
  struct MLP_information *mlpi = NULL;

  for (p = mlp->peer_head; p != NULL; p = p->next)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer `%s'\n", GNUNET_i2s (&p->id));
    for (a = p->head; a != NULL; a = a->next)
    {
      double b = 0.0;
      double n = 0.0;

      mlpi = a->mlp_information;

      b = glp_mip_col_val(mlp->prob, mlpi->c_b);
      mlpi->b = b;

      n = glp_mip_col_val(mlp->prob, mlpi->c_n);
      if (n == 1.0)
        mlpi->n = GNUNET_YES;
      else
        mlpi->n = GNUNET_NO;

      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "\tAddress %s %f\n",
          (n == 1.0) ? "[x]" : "[ ]", b);
    }
  }

  if (mlp->mlp_task != GNUNET_SCHEDULER_NO_TASK)
  {
    GNUNET_SCHEDULER_cancel(mlp->mlp_task);
    mlp->mlp_task = GNUNET_SCHEDULER_NO_TASK;
  }
  mlp->mlp_task = GNUNET_SCHEDULER_add_delayed (mlp->exec_interval, &mlp_scheduler, mlp);
  mlp->semaphore = GNUNET_NO;
  return res;
}
Exemplo n.º 4
0
int lpx_print_sol(LPX *lp, const char *fname)
{     /* write LP problem solution in printable format */
      return glp_print_sol(lp, fname);
}
Exemplo n.º 5
0
static PyObject* LPX_write(LPXObject *self, PyObject *args, PyObject *keywds)
{
	static char* kwlist[] = {"mps", "freemps", "prob", "sol", "sens_bnds",
		"ips", "mip", NULL};
	char* fnames[] = {NULL,NULL,NULL,NULL,NULL,NULL,NULL};
	char* fname;
	const char* err_msg = "writer for '%s' failed to write to '%s'";
	int rv;

	rv = PyArg_ParseTupleAndKeywords(args, keywds, "|sssssss", kwlist,
	fnames,fnames+1,fnames+2,fnames+3, fnames+4,fnames+5,fnames+6);

	if (!rv)
		return NULL;

	fname = fnames[0];
	if (fname != NULL) {
		rv = glp_write_mps(LP, GLP_MPS_DECK, NULL, fname);
		if (rv != 0) {
			PyErr_Format(PyExc_RuntimeError, err_msg, kwlist[0], fname);
			return NULL;
		}
	}

	fname = fnames[1];
	if (fname != NULL) {
		rv = glp_write_mps(LP, GLP_MPS_FILE, NULL, fname);
		if (rv != 0) {
			PyErr_Format(PyExc_RuntimeError, err_msg, kwlist[1], fname);
			return NULL;
		}
	}

	fname = fnames[2];
	if (fname != NULL) {
		rv = glp_write_lp(LP, NULL, fname);
		if (rv != 0) {
			PyErr_Format(PyExc_RuntimeError, err_msg, kwlist[2], fname);
			return NULL;
		}
	}

	fname = fnames[3];
	if (fname != NULL) {
		rv = glp_print_sol(LP, fname);
		if (rv != 0) {
			PyErr_Format(PyExc_RuntimeError, err_msg, kwlist[3], fname);
			return NULL;
		}
	}

	fname = fnames[4];
	if (fname != NULL) {
		if (glp_get_status(LP) == GLP_OPT && !glp_bf_exists(LP))
			glp_factorize(LP);
		rv = glp_print_ranges(LP, 0, NULL, 0, fname);
		if (rv != 0) {
			PyErr_Format(PyExc_RuntimeError, err_msg, kwlist[4], fname);
			return NULL;
		}
	}

	fname = fnames[5];
	if (fname != NULL) {
		rv = glp_print_ipt(LP, fname);
		if (rv != 0) {
			PyErr_Format(PyExc_RuntimeError, err_msg, kwlist[5], fname);
			return NULL;
		}
	}

	fname = fnames[6];
	if (fname != NULL) {
		glp_print_mip(LP, fname);
		if (rv != 0) {
			PyErr_Format(PyExc_RuntimeError, err_msg, kwlist[6], fname);
			return NULL;
		}
	}
	Py_RETURN_NONE;
}