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Hi David, to answer your questions: 1) Saving and Restoring jobs does not work properly in the Beta release of JAS. This will be fixed in the next release (end of April I hope). 2) There was a change in the LCDEvent which was not reflected in the tutorial. I have updated the tutorial now. event.getEMClusters() is correct. The threshold for the simple cluster finder is specified in raw measured energy units, so specifying 2 would certainly result in no clusters. You can produce a histogram showing the highest energy hit in a cluster using the code in the tutorial, which should help in selecting a suitable cutoff. Also you can just reject clusters based either on the number of hits or the total cluster energy. I think Joann is working on documentation for the JrbCluster() algorithm. We will add it to the tutorial as soon as it is ready. Tony -----Original Message----- From: David L. Wagner, University of Colorado [mailto:[log in to unmask]] Sent: Thursday, April 08, 1999 2:36 PM To: [log in to unmask] Subject: tutorial Hi Tony, I have just started playing with jas and going through the tutorial and I thought I would send you a few comments. 1) After I load a plugin, I'm not able to save the job; I get a message that says: Writing out object: java.io.NotSerializableException: hep.lcd.plugin.LCDPlugin And then my job file isn't usable any more. Is this standard, or is something about the installation on our machine? 2) In "The Cluster Finding Package" tutorial in the code for ClusterAnalyzer.java, the line ClusterList cl = event.getClusters() doesn't work; I had to change it to event.getEMClusters(). (Even then, for selectron pair events, I seem to get either 200 clusters / per event or no clusters at all, depending on the value I give to setEMThreshold(); the expected value would be 2 for selectron pairs. I tried adding a new JrbCluster() to the driver, but I just get a nullPointerException deep inside the program. Do you know if any documentation of the JrbCluster algorithm will be forthcoming?) -David