> Related to the length of 'ifelse' result, I want to say that "example of > different return modes" in ?ifelse led me to perceive a wrong thing in the > past. > ## example of different return modes: > yes <- 1:3 > no <- pi^(0:3) > typeof(ifelse(NA, yes, no)) # logical > typeof(ifelse(TRUE, yes, no)) # integer > typeof(ifelse(FALSE, yes, no)) # double > > As the result of each 'ifelse' call is not printed, I thought that the length > of the result is 3. In fact, the length of the result is 1.
"of course"... (;-) But this indeed proves that the example is too sophisticated and not helpful/clear enough. Is this better? ## example of different return modes (and 'test' alone determining length): yes <- 1:3 no <- pi^(1:4) utils::str( ifelse(NA, yes, no) ) # logical, length 1 utils::str( ifelse(TRUE, yes, no) ) # integer, length 1 utils::str( ifelse(FALSE, yes, no) ) # double, length 1 > I realize just now that the length of 'no' is different from 'yes'. The > length of 'yes' is 3, the length of 'no' is 4. ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
