I have an S4 class with a slot of class "array", and in upgrading to 2.0.1 (from 1.9.1) I have encountered a change in behaviour. This causes me some difficulties if I want to allow 2-dimensional arrays in the slot.
The following (in 2.0.1) illustrates the point: > setClass("foo",representation("array")) [1] "foo" > a <- new("foo",array(NA,2:4)) > b <- new("foo",matrix(NA,2,3)) Error in "as<-"(`*tmp*`, Classi, value = c(NA, NA, NA, NA, NA, NA)) : No method or default for as() replacement of "foo" with Class="matrix" This last error did not occur under 1.9.1. I conclude that in this context the methods package does not recognise "matrix" as a subclass of "array". However if I use getClass(), I see that R recognises "matrix" as a subclass of "array" (and vice-versa). So is this new behaviour correct? [this is a re-posting to R-devel of a question earlier posted to R-help, which attracted limited response] ______________________________________________ R-devel@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-devel