[R] Combinations of true/false values where one pair is mutually exclusive

R Stafford rod@@t@||ord @end|ng |rom gm@||@com
Thu Aug 2 17:41:36 CEST 2018

Thank you for pointing that out, I realize not only did I use the wrong
language but I did not describe the situation accurately.  I do need to
address the situation where both variables E and F actually pass, that is
the majority case, one or the other can fail, but there can never be a
situation where E and F both fail.  I do not know a specific term for that
situation, but you are correct that mutual exclusivity is wrong.   While I
can generate a list of all possible combinations with the expand.grid
function (which I am not committed to by the way), it would be very helpful
if I could exclude the combinations where E and F both fail.  I am not sure
where to go from here, but the solution does not have to be elegant or even
efficient because I do not need to scale higher than 6 variables.

On Thu, Aug 2, 2018 at 7:26 AM, S Ellison <S.Ellison using lgcgroup.com> wrote:

> > On Thu, Aug 2, 2018 at 11:20 AM, R Stafford <rod.stafford using gmail.com>
> > wrote:
> > > But I have the extra condition that if E is true, then F must be
> false, and
> > > vice versa,
> Question: Does 'vice versa' mean
> a) "if E is False, F must be True"
> or
> b) "if F is True, E must be False"?
> ... which are not the same.
> b) (and mutual exclusivity in general) does not rule out the condition "E
> False, F False", which would not be addressed by the
> pass/fail equivalent equivalent of F <- !E
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