Exercise: Index-Of Selfie Index   <<   >>


 

Check the veracity of the equivalences presented in the slide.

a.   
x←?1e6⍴8e5
(∪x) ≡ ((⍳≢x)=x⍳x)⌿x
 
b. 
u←⎕a[?97 12⍴26]
x←u[?200⍴≢u;]
y←u[?300⍴≢u;]
(x∧.=⍉y) ≡ (x⍳x)∘.=(x⍳y)
 
c. 
u←(1=?400⍴12)⊂⎕a[?400⍴26]
x←u[?200⍴≢u]
y←u[?300⍴≢u]
(x∘.≡y) ≡ (x⍳x)∘.=(x⍳y)