search for: nonsyntactical

Hi, Vince and I have noticed a problem with non-syntactic names in data frames and some modeling code (but not all modeling code). The following, while almost surely as documented could be a bit more helpful: m = matrix(rnorm(100), nc=10) colnames(m) = paste(1:10, letters[1:10], sep="_") d = data.frame(m, check.names=FALSE) f = formula(`1_a` ~ ., data=d) tm =

Full_Name: Gabor Grothendieck Version: R version 1.9.1, 2004-08-03 OS: Windows XP Submission from: (NULL) (207.35.143.52) The following gives an error: > `a(b)` <- 1:4 > `c(d)` <- (1:4)^2 > lm(`a(b)` ~ `c(d)`) Error in model.matrix.default(mt, mf, contrasts) : model frame and formula mismatch in model.matrix() To fix it replace this line in model.matrix.default:

...tor of length >=2. (PR#7205) o The GNOME interface was in some circumstances failing if run from a menu -- it needed to always specify that R be interactive. o depMtrxToStrings (part of pkgDepends) applied nrow() to a non-matrix and aborted on the result. o Fix some issues with nonsyntactical names in modelling code (PR#7202), relating to backquoting. There are likely more. o Support for S4 classes that extend basic classes has been fixed in several ways. as() methods and x at .Data should work better. o hist() and pretty() accept (and ignore) infinite values. (PR#7220)...

...tor of length >=2. (PR#7205) o The GNOME interface was in some circumstances failing if run from a menu -- it needed to always specify that R be interactive. o depMtrxToStrings (part of pkgDepends) applied nrow() to a non-matrix and aborted on the result. o Fix some issues with nonsyntactical names in modelling code (PR#7202), relating to backquoting. There are likely more. o Support for S4 classes that extend basic classes has been fixed in several ways. as() methods and x at .Data should work better. o hist() and pretty() accept (and ignore) infinite values. (PR#7220)...