X and Y may be any arrays. R is a simple Boolean array the same shape as Y which identifies occurrences of X within Y.
If the rank of X is smaller than the rank of Y, X is treated as if it were the same rank with leading axes of size 1. For example a vector is treated as a 1-row matrix.
If the rank of X is larger than the rank of Y, no occurrences of X are found in Y.
⎕CT and ⎕DCT are implicit arguments of Find.
'AN'⍷'BANANA' 0 1 0 1 0 0 'ANA'⍷'BANANA' 0 1 0 1 0 0 'BIRDS' 'NEST'⍷'BIRDS' 'NEST' 'SOUP' 1 0 0 MAT IS YOU IS OR IS YOU ISN'T 'IS'⍷MAT 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 'IS YOU'⍷MAT 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0