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Dear Bugs users, I just would like to share my little experience. I hope it can help !. When dealing with models that are "syntaxically correct", sometimes WinBUGS starts the simulations ... everything seems to be OK (and you have a caffe while waiting for the 100 000 iterations are achieved) ... but the sampler just trashes after a few (or sometimes many !) draws ... with a undecipherable trap message, like "Undefined real results". And for complex models, "debuging" may be quite hard because the trap message doesn't inform you where the error is !. To help debbuging, a quite basic but highly efficient solution that I experimented is to clik on "Save states" (Model menu) and to reinitialize the model with these states. Then, I you have chance, on the left down corner of your screen, the program will indicate you which nodes created the error, what can make you save a lot of time. Best, Etienne. Etienne RIVOT ********************************************************************* Etudiant en these / Ph.D. Student UMR Ecobiologie et Qualite des Hydrosystemes continentaux Institut National de la Recherche Agronomique 65, rue de St Brieuc, CS 84215, 35042 Rennes cedex, FRANCE Tel : +33 2 23 48 54 49 ; Fax : +33 2 23 48 54 40 Email : [log in to unmask] Internet : http://www.rennes.inra.fr/ ********************************************************************* ------------------------------------------------------------------- This list is for discussion of modelling issues and the BUGS software. For help with crashes and error messages, first mail [log in to unmask] To mail the BUGS list, mail to [log in to unmask] Before mailing, please check the archive at www.jiscmail.ac.uk/lists/bugs.html Please do not mail attachments to the list. To leave the BUGS list, send LEAVE BUGS to [log in to unmask] If this fails, mail [log in to unmask], NOT the whole list