quick programming question. I am not making enough errors in my programs, so I want to trigger a few more. ;-)
[1] undefined variable behavior: > d=data.frame( x=rnorm(1:10), y=rnorm(1:10)) > z Error: object 'z' not found > d$z NULL is this consistent? I thought that z is the same as .GlobalEnv$z, but apparently it is not. something here is smart enough to trigger an error. I like this error behavior. is it possible to set an R global option that triggers the same 'not found' error when an undefined element of a list or data frame is accessed? [just trying to check all my function arguments, and right now, I think I need to include for each argument 'stopifnot(is.null(argument))'. This clutters the code.] [2] is it possible to turn off recycling for vector operations? (I may have asked this at some point already, but I can't find the answer.) > a=c(2,3) > b=c(4,5,6,7) > a+b [1] 6 8 8 10 when I really want recycling, I would rather do it explicitly with rep. regards, /iaw ---- Ivo Welch (ivo.we...@brown.edu, ivo.we...@gmail.com) ______________________________________________ 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.
