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  E.  _ _ Member of Interval

    The ones in x E. y indicate the beginning points of occurrences of the pattern x in y .
 

For example:
   'co' E. 'cocoa'
1 0 1 0 0

   s #~ -. '**' E. s=: 'Remove***multiple**stars.'
Remove*multiple*stars.

   ] x =: 0 1 2 ,: 2 3 4
0 1 2
2 3 4

   ] y=: 5 | i. 5 7
0 1 2 3 4 0 1
2 3 4 0 1 2 3
4 0 1 2 3 4 0
1 2 3 4 0 1 2
3 4 0 1 2 3 4

   x E. y
1 0 0 0 0 0 0
0 0 0 1 0 0 0
0 1 0 0 0 0 0
0 0 0 0 1 0 0
0 0 0 0 0 0 0

   ($x) x&-: ;. 3 y
1 0 0 0 0 0 0
0 0 0 1 0 0 0
0 1 0 0 0 0 0
0 0 0 0 1 0 0
0 0 0 0 0 0 0


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