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Decrement <:  0 0 0 Less than or Equal

<:y is y-1 . For example:
   <: 2 3 5 7
1 2 4 6
Also see Not (-.) .
 		   x<:y is 1 if x is less than or equal to y , and is otherwise 0 . See Equal (=) for a discussion of tolerance. The fit conjunction (!.) applies to <: .
 

The inverse of <: is >: (Increment). For example:
   n=: 5

   <: ^: _1 n
6
        
   <:^: 0 1 2 n               NB. Here ^: applies to a noun right argument (0 1 2)
5 4 3

   <: ^: i. n                 NB. Here ^: applies to a verb right argument (i.)
5 4 3 2 1

   */ <: ^: i. n
120
            
   f=: */ @ (<: ^: i.)
   f n
120
            
   f"0 i. n
1 1 2 6 24

   (f"0 = !) i. n
1 1 1 1 1
  
   <:/ ~ i. 5                 NB. Table of the dyad <:
1 1 1 1 1
0 1 1 1 1
0 0 1 1 1
0 0 0 1 1
0 0 0 0 1
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