new function to update a value in the matrix

diff --git a/src/ats/gnunet-service-ats-solver_mlp.c b/src/ats/gnunet-service-ats-solver_mlp.c
index 4b754875099d79d5437388fe00758e1751b64037..12687eac46b4985d3e5ce47434dddc9358e73ec2 100644 (file)
--- a/src/ats/gnunet-service-ats-solver_mlp.c
+++ b/src/ats/gnunet-service-ats-solver_mlp.c
@@ -411,7 +411,76 @@ static int mlp_create_problem_count_addresses (
 }
 
 
+/**
+ * Updates an existing value in the matrix
+ *
+ * Extract the row, updates the value and updates the row in the problem
+ *
+ * @param p the mlp problem
+ * @param row the row to create the value in
+ * @param col the column to create the value in
+ * @param val the value to set
+ * @param line calling line for debbuging
+ */
+static void
+mlp_create_problem_update_value (struct MLP_Problem *p,
+                                                                                                                       int row, int col, double val,
+                                                                                                                       int line)
+{
+       int c_cols;
+       int c_elems;
+       int c1;
+       double *val_array;
+  int *ind_array;
+
+       GNUNET_assert (NULL != p);
+       GNUNET_assert (NULL != p->prob);
+
+       /* Get number of columns and prepare data structure */
+       c_cols = glp_get_num_cols(p->prob);
+       if (0 >= c_cols)
+               return;
+
+       val_array = GNUNET_malloc (c_cols * sizeof (double));
+       GNUNET_assert (NULL != val_array);
+       ind_array = GNUNET_malloc (c_cols * sizeof (int));
+       GNUNET_assert (NULL != ind_array);
+       /* Extract the row */
 
+       if (0 == (c_elems = glp_get_mat_row (p->prob, row, ind_array, val_array)))
+               return;
+
+       /* Update the value */
+       for (c1 = 0; c1 <= c_elems; c1++)
+       {
+               if (ind_array[c1] == row)
+                       break;
+       }
+       if (c_elems == c1)
+               return; /* not found */
+
+       /* Update value */
+       val_array[c1] = val;
+
+       /* Update the row in the matrix */
+       glp_set_mat_row (p->prob, row, c_elems, ind_array, val_array);
+  GNUNET_free (ind_array);
+  GNUNET_free (val_array);
+  //p-> = GNUNET_YES;
+}
+
+/**
+ * Creates a new value in the matrix
+ *
+ * Sets the row and column index in the problem array and increments the
+ * position field
+ *
+ * @param p the mlp problem
+ * @param row the row to create the value in
+ * @param col the column to create the value in
+ * @param val the value to set
+ * @param line calling line for debbuging
+ */
 static void
 mlp_create_problem_set_value (struct MLP_Problem *p,
                                                                                                                        int row, int col, double val,