There are 2^(2^length(tt)) possible "truth" vectors for the inputs
defined in tt. AND-ing all of the inputs only gives one of those possibilities.
Some popular named cases for 2 inputs are shown here [1], but it is common to
use combinations of !, & and | to specify a particular truth vector. There
is also the problem of reverse-engineering such a boolean expeession [2] in
simplest form from a given truth vector, but I don't know if anyone has
implemented such algorithms in R.
[1] https://en.wikipedia.org/wiki/Truth_table
[2] https://en.wikipedia.org/wiki/Karnaugh_maps
On March 12, 2022 2:17:32 PM PST, Bert Gunter <bgunter.4567 at gmail.com>
wrote:>...
>tt$truth <- tt$A & tt$B & tt$C
>to evaluate the outcome of expand.grid.
>
>or, as I said,
>tt$truth <- apply(tt,1, all)
>which works for any number of columns in tt.
>
>
>Bert Gunter
>
>"The trouble with having an open mind is that people keep coming along
>and sticking things into it."
>-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
>On Sat, Mar 12, 2022 at 2:02 PM Ebert,Timothy Aaron <tebert at
ufl.edu> wrote:
>>
>> To the end of Jeff's program add
>> tt$truth <- tt$A & tt$B & tt$C
>> to evaluate the outcome of expand.grid.
>>
>> Tim
>>
>> -----Original Message-----
>> From: R-help <r-help-bounces at r-project.org> On Behalf Of Jeff
Newmiller
>> Sent: Saturday, March 12, 2022 12:05 PM
>> To: r-help at r-project.org; Paul Bernal <paulbernal07 at
gmail.com>; R <r-help at r-project.org>
>> Subject: Re: [R] Is there a Truth Table Generator in R?
>>
>> [External Email]
>>
>> both <- c( FALSE, TRUE )
>> tt <- expand.grid( C = both
>> , B = both
>> , A = both
>> )
>> tt <- tt[, 3:1 ]
>>
>> On March 12, 2022 8:42:28 AM PST, Paul Bernal <paulbernal07 at
gmail.com> wrote:
>> >Dear friends,
>> >
>> >Hope you are doing great. I have been searching for a truth table
>> >generator in R, but everything I find has a Python implementation
instead.
>> >
>> >Maybe there is in fact a truth table generator in R, but I am not
>> >searching in the right places?
>> >
>> >Any help and/or guidance will be greatly appreciated.
>> >
>> >Best regards,
>> >Paul
>> >
>> > [[alternative HTML version deleted]]
>> >
>> >______________________________________________
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Sent from my phone. Please excuse my brevity.