> On 19 May 2017, at 14:24 , Jérémie Juste <jeremieju...@gmail.com> wrote: > > My apologies if I was not clear enough, > > TRUE & NA could be either TRUE or FALSE and consequently is NA. > why is FALSE & NA = FALSE? NA could be TRUE or FALSE, so FALSE & NA > should be NA? >
At the risk of flogging a dead horse: FALSE & TRUE = FALSE FALSE & FALSE = FALSE FALSE & x = FALSE, whatever the value of x, hence FALSE & NA = FALSE Get it? -pd > > On Fri, May 19, 2017 at 2:13 PM, Rolf Turner <r.tur...@auckland.ac.nz> > wrote: > >> On 20/05/17 00:01, Jérémie Juste wrote: >> >>> Hello, >>> >>> Rolf said, >>> >>> TRUE & FALSE is FALSE but TRUE & TRUE is TRUE, so TRUE & NA could be >>> either TRUE or FALSE and consequently is NA. >>> >>> OTOH FALSE & (anything) is FALSE so FALSE & NA is FALSE. >>> >>> >>> According to this logic why is >>> >>> FALSE & NA >>> >>> [1] FALSE >>> >> >> Huh???? >> >> >> cheers, >> >> Rolf Turner >> >> -- >> Technical Editor ANZJS >> Department of Statistics >> University of Auckland >> Phone: +64-9-373-7599 ext. 88276 >> > > > > -- > Jérémie Juste > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.