wcost←{                 ⍝ Cost vector for path ⍵ through weighted graph ⍺.
    graph costs←↓⍺      ⍝ edges and edge-costs.
    2>≢⍵:0              ⍝ null path: no cost.
    2{                  ⍝ ⍺:from, ⍵:to.
        node←,⍺⊃graph   ⍝ exits from vertex.
        indx←node⍳⍵     ⍝ index of (⍺ ⍵) vertex.
        indx⊃,⍺⊃costs   ⍝ ... associated cost.
    }/⍵                 ⍝ pairwise along path.
}

code_colours

test script

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