⍝ Sum of (decimal by default) columns:

    colsum 10 10⍴⍳9             ⍝ decimal sum.
5 1 2 3 4 5 6 7 8 8 6

    colsum 10 10⍴1              ⍝ decimal sum.
1 1 1 1 1 1 1 1 1 1 0

    2 colsum 10 10⍴1            ⍝ binary sum.
1 0 0 1 1 1 1 1 1 1 0 1 1 0

    3 colsum 10 10⍴1            ⍝ ternary sum.
1 1 2 2 2 2 2 2 2 2 1 1

    colsum 4 5⍴⍳9               ⍝ 5-column sum.
1 8 2 6 0 4

    16 colsum ⍪, 1000           ⍝ decimal 1000 in hexadecimal.
3 14 8

   (1 400/1 0)≡colsum ↑(399 1/0 1)(400/9)   ⍝ accurate beyond IEEE 64-bit FP.
1

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