C. Transformations

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# 11C. Transformations

`m0=: ] i."1&.|: 1 _1"_` | Column node table from connection table columns (inverse to m3)
`m1=: ] (i."1) 1 _1"_` | Node table from connection table rows (inverse to m4)
`m2=: [:-/ ] =/ [:i. [:>: [:>./ ,` | Row connection table from node table columns
`m3=: [: |: m2` | Column connection table from node table columns (inverse to m0)
`m4=: [:-/"2 ] =/ [:i. [:>: [:>./ ,` | Row connection table from node table rows (inverse to m1)

       y
     1  1  0  0  0
     0 _1  0  1  1
    _1  0  1 _1  0
     0  0 _1  0 _1

       m0 y
    0 0 2 1 1
    2 1 3 2 3

       m3 m0 y
     1  1  0  0  0
     0 _1  0  1  1
    _1  0  1 _1  0
     0  0 _1  0 _1

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