後置項 m\.  u\.  _ 0 _ 挖空項

u\.y has #y items resulting from applying u to suffixes of y ,beginning with one of length #y (亦即, y itself),與continuing through a suffix of length 1 .

m\.y applies successive 動詞 from 動名詞 m to suffixes of y ,extending m cyclically as required.
 
  If x>:0 in x u\. y ,n u 應用於outfixes of y obtained by suppressing successive infixes of length x .If x<0 , outfixes result from suppressing non-overlapping infixes, last of which may be a shard.

x m\.y applies successive 動詞 from 動名詞 m to outfixes of y, extending m cyclically as required.
 

   */\. y=: 1 2 3 4 5
120 120 60 20 5

   <\. y
+---------+-------+-----+---+-+
|1 2 3 4 5|2 3 4 5|3 4 5|4 5|5|
+---------+-------+-----+---+-+

   3 <\. 'abcdefgh'
+-----+-----+-----+-----+-----+-----+
|defgh|aefgh|abfgh|abcgh|abcdh|abcde|
+-----+-----+-----+-----+-----+-----+

   _3 <\. 'abcdefgh'
+-----+-----+------+
|defgh|abcgh|abcdef|
+-----+-----+------+

   ]m=: i.3 3
0 1 2
3 4 5
6 7 8

   <"_2 (子式=: 1&(|:\.)"2^:2) m
+---+---+---+
|4 5|3 5|3 4|
|7 8|6 8|6 7|
+---+---+---+
|1 2|0 2|0 1|
|7 8|6 8|6 7|
+---+---+---+
|1 2|0 2|0 1|
|4 5|3 5|3 4|
+---+---+---+

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