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Useful functions in APL
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| segs ← ⊃,/∘(⍳∘≢,/¨⊂) | |
| segs ← (⊃,/)⍳∘⊃∘⌽∘⍴,/¨⊂ ⍝ works for matrix also | |
| freq ← ((⎕C ⎕A)∘.=⊢) | |
| mseg ← {⎕IO←0 ⋄ (⍳∘≢⍵)∘.{⍺↓⍵},\⍵} ⍝ all subvectors in correct position | |
| bits ← 2∘⊥⍣¯1 | |
| pdf←{ | |
| ⍺←(0 1) | |
| nom←*⍤-2÷⍨*∘2 | |
| denom←0.5*⍨○2 | |
| phi←denom÷⍨nom | |
| (mean sigma)←⍺ | |
| sigma÷⍨phi(⍵-mean)÷sigma | |
| } | |
| norm ← ⊢(÷⍤1 0) +/ |
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