On Thu, 15 Apr 2004 10:40:41 -0400, "Liaw, Andy" <[EMAIL PROTECTED]> wrote :
>Dear R-help, > >I was bitten by the behavior of all() when given logical(0): It is TRUE! >(And any(logical(0)) is FALSE.) Wouldn't it be better to return logical(0) >in both cases? As Rolf said, this behaviour makes sense. >The problem surfaced because some un-named individual called randomForest(x, >y, xtest, ytest,...), and gave y as a two-level factor, but ytest as just >numeric vector. I thought I check for that in my code by testing for > >if (!all(levels(y) == levels(ytest))) stop(...) You should fix this by having y <- as.factor(y) and ytest <- as.factor(ytest) somewhere earlier in your code, since your code assumes that they are both factors, but doesn't enforce that in its input checks. Duncan Murdoch ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
