Logical Operators

x < y	True if x is less than y
x > y	True if x is greater than y
x <= y	True if x is less than or equal to y
x >= y	True if x is greater than or equal to y
x == y	True if x is equal to y
x != y	True if x is not equal to y

x AND y	x && y
x OR y	x || y
x XOR y	xor(x,y)
NOT x	!x

    
  
     

Examples

IDs <- which(v > 10)  

idx = is.na(..)   # find NA's; idx is logical index vector
!idx                   # not ...   (invert logicals of idx)
idx = !is.na(..)  # both together

is.finite - (elements not infinite and not missing)
is.finite(..)