Index-Of Extension Index   <<   >>

 

x⍳y  ←→  (⊂⍤¯1⊢x) ⍳ ⊂⍤(¯1+⍴⍴x)⊢y
 ←→  (⊂[1↓⍳⍴⍴x]x) ⍳
        ⊂[(1-⍴⍴x)↑⍳⍴⍴y]y
 
    generalization of matiota {(↓⍺)⍳↓⍵}