Maximum distance among 3-D points

      ⊢A ← ?6 3⍴0
0.3349932788  0.7397139049  0.24485046
0.40858244    0.06364036903 0.9221502212
0.09579008111 0.5432285983  0.5325855879
0.1817576792  0.8612152057  0.7752292961
0.4695255775  0.9138674043  0.6445105891
0.7025187821  0.2501759014  0.7485675001

      len ← {0.5 *⍨ +⌿ ⍵*2}

      ⌈/, {len ⍺-⍵}⍤99 1⍤1 99⍨ A
0.9598050621

      ⌈/, len -⍤1 0⍤0 1⍤1⍨ ⍉A
0.9598050621