Matlab Crack Detection Since we have the classifier, we need to analyze it using Matlab. This example features the technique that we used prior to: PFS (pfSense). The method finds nodes with no sign in them. (There is a link on the Github Project page to an article that discusses the technique, but no information available on how to build PFS). The results follow on the graph as the label is rotated. This is where you’d expect the label rotated. From this image