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-∇ R←M COMBIN N;D;E;F;G;P
- ⍝ Returns a matrix of every possible
- ⍝ combination of M elements from the
- ⍝ vector ⍳N. That is, returns a
- ⍝ matrix with M!N rows and N columns.
- ⍝
- E←(⍳P←N-R←M-1)-⎕IO
- D←R+⍳P
- R←(P,1)⍴D
- P←P⍴1
- L1:→(⎕IO>1↑D←D-1)⍴0
- P←+\P
- G←+\¯1↓0,F←⌽P
- E←F/E-G
- R←(F/D),R[E+⍳⍴E;]
- E←G
- →L1
-∇
-
-∇ R←M QUICKEXP N
- ⍝ Matrix exponentiation
- B ← ⌊ 1 + 2 ⍟ N
- V ← (B ⍴ 2) ⊤ N
- L ← ⊂ M
- R ← ⊃ +.× / V / L ⊣ { L ← (⊂ A +.× A ← ↑L) , L }¨ ⍳ B-1
-∇