chapter23 .........\barrier.txt .........\DijkstraPlan.m __MACOSX ........\chapter23 ........\.........\._DijkstraPlan.m chapter23\DijstraPlan.m __MACOSX\chapter23\._DijstraPlan.m chapter23\lines.txt .........\main.m __MACOSX\chapter23\._main.m chapter23\matrix.txt