} Item Amend • Amend

>> << Usr Pri JfC LJ Phr Dic Rel Voc !: Help Dictionary

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.

>> << Usr Pri JfC LJ Phr Dic Rel Voc !: Help Dictionary