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 Tally #  _ 1 _ Copy

 #y is the number of items in y . Thus: ``` (#'');(#'a');(#'octothorpe') +-+-+--+ |0|1|10| +-+-+--+ (#3);(#,3);(# 3 4) +-+-+-+ |1|1|2| +-+-+-+ (#i.4 5 6);(#\$i.4 5 6) +-+-+ |4|3| +-+-+ ``` If the arguments have an equal number of items, then x#y copies +/x items from y, with i{x repetitions of item i{y . Otherwise, if one is an atom it is repeated to make the item count of the arguments equal. The complex left argument a j. b copies a items followed by b fills. The fit conjunction provides specified fills, as in #!.f .

Copy is illustrated by the following examples:
```   0 1 2 3 4 5 # 0 1 2 3 4 5
1 2 2 3 3 3 4 4 4 4 5 5 5 5 5

t=: 3 4 \$'abcdefghijkl' [ n=: i. 3 4
t ; n ; (3 0 1 # t) ; (3 0 1 # n) ; (3 1 4 2 #"1 t)
+----+---------+----+---------+----------+
|abcd|0 1  2  3|abcd|0 1  2  3|aaabccccdd|
|efgh|4 5  6  7|abcd|0 1  2  3|eeefgggghh|
|ijkl|8 9 10 11|abcd|0 1  2  3|iiijkkkkll|
|    |         |ijkl|8 9 10 11|          |
+----+---------+----+---------+----------+

k=: 2j1 0 1j2
(k # t);(k # n);(k  #!.'*' t);(k #!.4 n)
+----+---------+----+---------+
|abcd|0 1  2  3|abcd|0 1  2  3|
|abcd|0 1  2  3|abcd|0 1  2  3|
|    |0 0  0  0|****|4 4  4  4|
|ijkl|8 9 10 11|ijkl|8 9 10 11|
|    |0 0  0  0|****|4 4  4  4|
|    |0 0  0  0|****|4 4  4  4|
+----+---------+----+---------+
```

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