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Revision of errors from Fri, 08/28/2009 - 20:39

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argument is missing, with no default

Variations include:
Error in : argument is missing, with no default

Typical cause: A leading or trailing comma in your code makes R think that you wanted to pass in a parameter, but left it empty (hence "missing, with not default")

leading comma

trailing comma
nrow=3,ncol=3,free=TRUE, values=.5,

Cure: remove the errant comma