| %ni% | R Documentation | 
'%ni%' identifies which element in x is NOT in y
x %ni% y
| x | a vector of elements which can be numeric or character | 
| y | a vector of elements which can be numeric or character | 
   x <- 1:10
   y <- 6:15
   x
   y
   x[(x %ni% y)]   # are not in y
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