[EMAIL PROTECTED] writes: > > foo <- expression(alpha, beta, gamma) > > foo[2] > expression(beta) > > foo[2] <- NA > > foo ## or str(foo) > Segmentation fault > > (Same behaviour in R 1.9.1) > > 'foo[[2]] <- NA' works fine, though.
Right. The NA is not important; foo[2] <- 1 crashes R just as effectively. We should likely either give an error or demote [ to [[. The latter is what happens with lists, and expressions are basically just list of call objects (or names or constants). To wit: > x <- list(1,2,3) > x[2] <- 1 > x [[1]] [1] 1 [[2]] [1] 1 [[3]] [1] 3 -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
