iotag←{⎕ML←3                        ⍝ Generalized ⍳.
    AlphaInterval←{⍵=' ':''         ⍝ ⍳' ' is empty vector.
        a←⎕AV⍳'a0AÁ'                ⍝ Indices of a0AÁ.
        k←⎕IO+a+.<i←1+⎕AV⍳⍵         ⍝ Find starting point.
        ⍺←⎕AV[a[k-1]]               ⍝ Default left argument.
        ≤/i,j←⎕AV⍳⍺:⌽⍵ ∇ ⍺          ⍝ If ⍵ before ⍺, reverse.
        (j-⎕IO)↓(i-⎕IO)↑⎕AV         ⍝ Truncate ⎕AV.
    }
   ⍝Interval←{⍺+0,+\(|d)⍴×d←⍵-⍺}    ⍝ Interval Function.
    Interval←{s←×/1↓⍵,(⍺>↑⍵)/¯1     ⍝ Calculate step size
        ⍺-s×⎕IO-⍳⌊1-(⍺-↑⍵)÷s}       ⍝ Generate Interval
    IndexOf←{i←1↓⍳⍴⍴⍺               ⍝ Enclose left arg axis.
        j←(1-⍴⍴⍺)↑⍳⍴⍴⍵              ⍝ Enclose right arg axis.
        m←(⍴⍺)[i]⌈(⍴⍵)[j]           ⍝ Pad both arguments.
        (⊂[i]m↑[i]⍺)⍳⊂[j]m↑[j]⍵     ⍝ Get index.
    }
    ischar←{0 2∊⍨10|⎕DR ⍵}          ⍝ type ∊ 82 80 160 ...
    m←0=⎕NC'⍺'                      ⍝ Monadic?
    m∧1=⍴⍴⍵:↑∘.,/∇¨⍵                ⍝ Vector right argument
    m∧ischar ⍵:AlphaInterval ⍵      ⍝ Alpha Monadic.
    m:(×⍵)×⍳|⍵                      ⍝ Integer Monadic.
    s←0=⍴⍴⍺                         ⍝ Scalar Left Argument?
    s∧ischar ⍵:⍺ AlphaInterval ⍵    ⍝ Alpha Interval.
    s:⍺ Interval ⍵                  ⍝ Numeric Interval.
    ⍺ IndexOf ⍵                     ⍝ Dyadic.
}

code_colours

test script

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