I'm also suspicious of code using parse to construct expressions. However this problem arose because the terms class is a subclass of the formula class and AlgDesign defines a model.matrix method for the formula class but not for the terms class. Hence model.matrix(terms(...)) invokes model.matrix.formula, which causes the problem because AlgDesign::model.matrix.formula isn't general enough to handle a terms object.
If AlgDesign had a model.matrix.terms function that called model.matrix.default or was a copy of model.matrix.default then the problem would go away. Bill Dunlap TIBCO Software Inc - Spotfire Division wdunlap tibco.com >> library(AlgDesign) > >> aov(Sepal.Length ~ Species, data=iris) > > Error in parse(text = x) : > unexpected symbol in "Sepal(Sepal.Length+Species)Length" ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
