Help / Phrases / 2. B. Rank

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2B. Rank

`m0=: +/`	sum (column sums of a matrix)
`m1=: +/"1`	sum vectors (row sums of a matrix)
`d2=: *"0 _`	outer product; same as `*/`
`m3=: +/@(*"1 _)`	inner product; same as `+/ .*`

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