On 4/26/2007 9:53 AM, [EMAIL PROTECTED] wrote: > Hi! > > I'm puzzled by the return value of ifelse > > consider > > x<-integer(0) > ifelse(is(x, "character"), paste(x), x) > [1] NA
The test evaluates to a length 1 logical vector containing FALSE. So ifelse() tries to return the first entry of x. But x[1] doesn't exist, so it evaluates to NA, and that's what ifelse() returns. > > whereas > if (is(x, "character")) return(paste(x)) else x > [1] integer(0) This is quite different. It says to return the expression in the else clause, which is x. > > or > x<-integer(1) > ifelse(is(x, "character"), paste(x), x) > [1] 0 > > work as I had anticipated. Is this correct behaviour? Yes, this is correct. Duncan Murdoch ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
