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Y may be any array.  R is a vector of the elements of Y taken in row-major order.

Examples

      M
1 2 3
4 5 6
 
      ,M
1 2 3 4 5 6
 
      A
ABC
DEF
GHI
JKL
 
      ,A
ABCDEFGHIJKL
 
      ⍴,10
1

See also: Ravel with Axes.