[R] "logical indexing, " [was] match() question or needle haystack problem for a data.frame

[MacQueen, Don]

Wrong comparisons, I think.

The opposite of
  A & B
is 
  !(A & B)

There is no single operator that can replace the "&" in A & B that gives the "opposite"

-Don

--
Don MacQueen
Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062
Lab cell 925-724-7509
 
 

On 10/25/18, 11:28 PM, "R-help on behalf of Knut Krueger" <r-help-bounces using r-project.org on behalf of rhelp using krueger-family.de> wrote:

    Am 25.10.18 um 16:13 schrieb peter dalgaard:
    > 
    >
    > Yes: x[!(x$A %in% y$B),]
    
    Ok thats in my opinion a little workaround
    why?:
    
    There is an
    = and !=
    < and >
    
    
    means the opposite is available between terms.
    
    why is there f.e no %!in%, %notin%  or !%in%
    
    This would be more intuitive.
    
    Kind regards Knut
    
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