R help - Aug 2018 - Combinations of true/false values where one pair is mutually exclusive

I have 6 variables, (A,B,C,D,E,F) that can either pass or fail (i.e., true
or false).
I can get a table of all pass/fail combinations with this:

scenarios <- expand.grid(A = c("pass", "fail"), B =
c("pass", "fail"), C c("pass", "fail"),
D = c("pass", "fail"), E = c("pass",
"fail"), F c("pass", "fail"))

But I have the extra condition that if E is true, then F must be false, and
vice versa, so what I don't know is how to get all combinations when E and F
are mutually exclusive.

	[[alternative HTML version deleted]]

Hi Rod,
How about this?

scenarios <- expand.grid(A = c("pass", "fail"), B =
c("pass", "fail"), C c("pass", "fail"),
D = c("pass", "fail"), E = c("pass",
"fail"))
scenarios$F<-ifelse(scenarios$E=="pass","fail","pass")

Jim



On Thu, Aug 2, 2018 at 11:20 AM, R Stafford <rod.stafford at gmail.com>
wrote:
> I have 6 variables, (A,B,C,D,E,F) that can either pass or fail (i.e., true
> or false).
> I can get a table of all pass/fail combinations with this:
>
> scenarios <- expand.grid(A = c("pass", "fail"), B =
c("pass", "fail"), C > c("pass",
"fail"), D = c("pass", "fail"), E =
c("pass", "fail"), F > c("pass",
"fail"))
>
> But I have the extra condition that if E is true, then F must be false, and
> vice versa, so what I don't know is how to get all combinations when E
and F
> are mutually exclusive.
>
>         [[alternative HTML version deleted]]
>
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> On Thu, Aug 2, 2018 at 11:20 AM, R Stafford <rod.stafford at
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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