The Problem
Index
<<
>>
x i. y
x⍳y
APL\360
definition:
+/*./\x~:/y
+⌿∧⍀x∘.≠y
Extended definition:
+/*./\x~:/&:<"(_1+#$x)y
+⌿∧⍀(⊂⍤¯1⊢x)∘.≢⊂⍤(¯1+≢⍴x)⊢y
Related functions:
membership
nub
(
unique
)
nub sieve
tally nub
key
operator
etc.