Greetings! I come to R by way of Matlab. One feature in Matlab I miss is its "end" keyword. When you put "end" inside an indexing expression, it is interpreted as the length of the variable along the dimension being indexed. For example, if the same feature were implemented in R:
my.vector[5:end] would be equivalent to: my.vector[5:length(my.vector)] or: this.matrix[3:end,end] would be equivalent to: this.matrix[3:nrow(this.matrix),ncol(this.matrix)] # or this.matrix[3:dim(this.matrix)[1],dim(this.matrix)[2]] As you can see, the R version requires more typing, and I am a lousy typist. With this in mind, I wanted to try to implement something like this in R. It seems like that in order to be able to do this, I would have to be able to access the parse tree of the expression currently being evaluated by the interpreter from within my End function-- is this possible? Since the "[" and "[[" operators are primitive I can't see their arguments via the call stack functions... Anyone got a workaround? Would anybody else like to see this feature added to R? Thanks, Mike ______________________________________________ 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.
