In ?options, one reads warnings.length, but it should be warning.length. Version: platform = i386-apple-darwin8.10.1 arch = i386 os = darwin8.10.1 system = i386, darwin8.10.1 status = major = 2 minor = 6.1 year = 2007 month = 11 day = 26 svn rev = 43537 language = R version.string = R version 2.6.1 (2007-11-26)
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