I saw the following thread on comp.lang.apl http://groups.google.com/group/comp.lang.apl/browse_thread/thread/89c585c9d1a7bd3a# and was trying to put together a (non-regex) J solution.
Given the matrix: ]A=: 'CTGGTTGAT','GTAGTCATA','CATGTCTAA','TCGAAAGTT',:'CCGGAGAAG' CTGGTTGAT GTAGTCATA CATGTCTAA TCGAAAGTT CCGGAGAAG and the list 'TAG' Identify the rows of the matrix where the letters in the list occur in the order they appear in the list, but not necessarily adjacent to each other. So the result of a verb findinRows would be: A findinRows 'TAG' 0 1 0 1 0 I have an answer below but am thinking there may be other approaches I'm missing Spoiler alert!! findinRows=: [: (1 e. ,@:(</))&>/ 2 (([: ($ #. ]) 4 $. [: $. </)&.>)/\ [: <@I."1 ="_ 0 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
