X-Git-Url: https://www.fleuret.org/cgi-bin/gitweb/gitweb.cgi?p=mtp.git;a=blobdiff_plain;f=mtp_example.cc;h=c1f67787e453f695603798512f1763dc9108846d;hp=91e4d6b24b4f607290375ad96f637e4d9a9b1cbb;hb=20f94c6bff1541da8d0639966787dc8aaafea025;hpb=ecf9426e0c2db90a095efd32aade09b135e9ec20

diff --git a/mtp_example.cc b/mtp_example.cc
index 91e4d6b..c1f6778 100644
--- a/mtp_example.cc
+++ b/mtp_example.cc
@@ -24,6 +24,7 @@
 
 #include <iostream>
 #include <fstream>
+#include <stdlib.h>
 
 using namespace std;
 
@@ -49,20 +50,31 @@ int main(int argc, char **argv) {
 
   tracker->allocate(nb_time_steps, nb_locations);
 
-  // We define the spatial structures by stating what are the possible
-  // motions of targets, and what are the entrances and the
-  // exits.
+  // We define the spatial structure by stating what are the possible
+  // motions of targets, and what are the entrances and the exits.
 
   // Here our example is a 1D space with motions from any location to
   // any location less than motion_amplitude away, entrance at
-  // location 0 and exit at location nb_locations-1.
+  // location 0 (or in the first time frame, i.e. targets can already
+  // be in the scene when the sequence starts) and exit at location
+  // nb_locations-1 (or from the last time frame, i.e. targets can
+  // still be present when the sequence finishes)
 
   for(int l = 0; l < nb_locations; l++) {
-    for(int k = 0; k < nb_locations; k++) {
-      tracker->allowed_motion[l][k] = abs(l - k) <= motion_amplitude;
+    for(int m = 0; m < nb_locations; m++) {
+      tracker->allowed_motions[l][m] = abs(l - m) <= motion_amplitude;
+    }
+  }
+
+  for(int t = 0; t < nb_time_steps; t++) {
+    for(int l = 0; l < nb_locations; l++) {
+      // We allow targets to enter in the first time frame, or in
+      // location 0
+      tracker->entrances[t][l] = (t == 0 || l == 0);
+      // We allow targets to leave from the last time frame, or from
+      // location nb_locations-1
+      tracker->exits[t][l] = (t == nb_time_steps - 1 || l == nb_locations-1);
     }
-    tracker->entrances[0] = 1;
-    tracker->exits[nb_locations - 1] = 1;
   }
 
   // We construct the graph corresponding to this structure
@@ -122,7 +134,7 @@ int main(int argc, char **argv) {
     tracker->write(&out_tracker);
   }
 
-  // Does the tracking per se
+  // Performs the tracking per se
 
   tracker->track();
 
@@ -134,7 +146,7 @@ int main(int argc, char **argv) {
          << " starting at " << tracker->trajectory_entrance_time(t)
          << ", duration " << tracker->trajectory_duration(t)
          << ", score " << tracker->trajectory_score(t)
-         << ", through nodes ";
+         << ", through locations";
     for(int u = 0; u < tracker->trajectory_duration(t); u++) {
       cout << " " << tracker->trajectory_location(t, u);
     }