[R] %in% with matrix of lists

[Neal H. Walfield]

On Sat, 30 Jul 2016 20:35:40 +0200,
Jeff Newmiller wrote:
> 
> >> [1]  TRUE FALSE  TRUE FALSE  ## NOT c(T,F,T,F)
> >
> >I'm not sure what you mean by NOT here.  You get the same answer as I
> >do, as far as I can see.
> >
> 
> # valid R
> T <- FALSE
> # invalid R
> TRUE <- FALSE
> 
> It is much much safer and clearer to use TRUE/FALSE than T/F. So
> 
> c( TRUE, FALSE,  TRUE, FALSE ) may not always be the same as c(T,F,T,F).

I see.  I was just trying to create a minimal example.  I'll try to be
more vigorous next time!

> I recommend reading the R Inferno to learn about this other such pitfalls. 

Thanks for the tip!