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Ravel ,  _ _ _ Append

,y gives a list of the atoms of y in “normal” order: the result is ordered by items, by items within items, etc. The result shape is 1$*/$ y . Thus:
   y=: 2 4 $ 'abcdefgh'

   y
abcd
efgh

   ,y
abcdefgh
  x,y appends items of y to items of x after:

1. Reshaping an atomic argument to the shape of the items of the other,
2. Bringing the arguments to a common rank (of at least 1) by repeatedly itemizing (,:) any of lower rank, and
3. Bringing them to a common shape by padding with fill elements in the manner described in Section II B.

The fit conjunction (,!.f) provides fill specified by the atom f .
 		 

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

 9 10 11
12 13 14
15 16 17

   ,a
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

   ,"2 a
0  1  2  3  4  5  6  7  8
9 10 11 12 13 14 15 16 17
The following examples illustrate the dyadic case:
   ('abc','de');('abc',"0/'de');(5 6 7,i.2 3);(7,i.2 3)
+-----+--+-----+-----+
|abcde|ad|5 6 7|7 7 7|
|     |ae|0 1 2|0 1 2|
|     |  |3 4 5|3 4 5|
|     |bd|     |     |
|     |be|     |     |
|     |  |     |     |
|     |cd|     |     |
|     |ce|     |     |
+-----+--+-----+-----+
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