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 Item Amend u}  _ _ _ Amend

 u} is defined in terms of the noun case m} , the verb u applying to the argument or arguments to provide the numeric indices required by it.

For example:
```   x=: 100 + i. 2 4
u=: */@\$@] | (5: * i.@\$@[)
y=: i. 3 2 4
x ; y ; (x u y) ; (x u} y)
+---------------+-----------+----------+---------------+
|100 101 102 103| 0  1  2  3| 0 5 10 15|100 105   2   3|
|104 105 106 107| 4  5  6  7|20 1  6 11|  4 101 106   7|
|               |           |          |               |
|               | 8  9 10 11|          |  8   9 102 107|
|               |12 13 14 15|          | 12  13  14 103|
|               |           |          |               |
|               |16 17 18 19|          | 16  17  18  19|
|               |20 21 22 23|          |104  21  22  23|
+---------------+-----------+----------+---------------+
```
The positions selected by x u} y may be made to depend on either or both of the arguments x and y , and related adverbs can be defined for convenient use in common cases. For example:
```   A=: @(i.@\$@])
u=: (<0 1)&|:
x=: 'DIAG' [ y=: a. {~ (a. i. 'a') + i. 4 5
x;y;(x u A y);(x u A} y)
+----+-----+---------+-----+
|DIAG|abcde|0 6 12 18|Dbcde|
|    |fghij|         |fIhij|
|    |klmno|         |klAno|
|    |pqrst|         |pqrGt|
+----+-----+---------+-----+
```
Also see the case m} for the use of gerunds.

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