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Agenda m@.n  m@.v  mv lv rv

m@.n is a verb defined by the gerund m with an agenda specified by n ; that is, the verb represented by the train selected from m by the indices n . If n is boxed, the train is parenthesized accordingly. The case m@.v uses the result of the verb v to perform the selection.
 

For example:
   dorh=: +: ` -: @. (]>9:)           Double or halve (Case statement)
   dorh " 0 primes=: 2 3 5 7 11 13 17 19
4 6 10 14 5.5 6.5 8.5 9.5

   _:`%:`*: @. * "0 a=: 2 1 0 _1 _2
1.41421 1 _ 1 4

   g=: +`-`* 
   x=: 1 2 3 [ y=: 6 5 4
   (x g@.2: y)
6 10 12
         
   (] * <:) y=: 5 4 3 2 1 0           Basis of factorial
20 12 6 2 0 0
                    
   1:`(] * <:) @. (1: < ]) "0 y       Case statement
20 12 6 2 1 1
      
   1:`(] * $:@<:)@.(1: < ])"0 y       Self-reference for recursion
120 24 6 2 1 1

   +`-`*`% @. (1 0 3;2 0)
(- + %) (* +)

   3 +`-`*`% @. (1 0 3;2 0) 4
_12.8125

   perm=: i.@i.@_2: ` ([: ,/ (0: ,. $:&.<:) {"2 1 \:"1@=@i.) @. *
   perm 3
0 1 2
0 2 1
1 0 2
1 2 0
2 0 1
2 1 0


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