DataFrame.opIndex

Undocumented in source. Be warned that the author may not have intended to support it.
  1. KalVariant opIndex(size_t row, size_t col)
  2. auto opIndex(size_t[] rows, size_t[] cols)
    struct DataFrame
    opIndex
    (
    size_t[] rows
    ,
    size_t[] cols
    )

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