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 Head {.  _ 1 _ Take

 {.y selects the leading item of y , or an item of fills if y has no items; that is, {.y ↔ 0{1{.y . Thus: ``` a=: i. 3 2 3 a;({.a);({."2 a);({."1 a) +--------+-----+--------+-----+ | 0 1 2|0 1 2| 0 1 2| 0 3| | 3 4 5|3 4 5| 6 7 8| 6 9| | | |12 13 14|12 15| | 6 7 8| | | | | 9 10 11| | | | | | | | | |12 13 14| | | | |15 16 17| | | | +--------+-----+--------+-----+ ]b=: ;/a +-----+-------+--------+ |0 1 2|6 7 8|12 13 14| |3 4 5|9 10 11|15 16 17| +-----+-------+--------+ {.&> b 0 1 2 6 7 8 12 13 14 {. i.0 3 0 0 0 ``` If x is an atom, x{.y takes from y an interval of |x items; beginning at the front if x is positive, ending at the tail if it is negative. In an overtake (in which the number to be taken exceeds the number of items), extra items consist of fills; zeros if y is numeric, a: if it is boxed, spaces if literal, and s: ' ' if symbol. The fill atom f is also specified by fit, as in {.!.f . In general, if y is not an atom, x may be a list of length not more than \$\$y , and if y is an atom, it is replaced by ((#x)\$1)\$y . Element k produces (k{x){."((\$\$y)-k) y ; an infinite value is replaced by the length of the corresponding axis.

The following examples illustrate the use of the dyad take:
```   y=: i. 3 4
y;(2{.y);(5{.y);(_5{.y);(_6{.'abcd');(2 _3{.y)
+---------+-------+---------+---------+------+-----+
|0 1  2  3|0 1 2 3|0 1  2  3|0 0  0  0|  abcd|1 2 3|
|4 5  6  7|4 5 6 7|4 5  6  7|0 0  0  0|      |5 6 7|
|8 9 10 11|       |8 9 10 11|0 1  2  3|      |     |
|         |       |0 0  0  0|4 5  6  7|      |     |
|         |       |0 0  0  0|8 9 10 11|      |     |
+---------+-------+---------+---------+------+-----+

2 {."1 y
0 1
4 5
8 9

_ 2 {. y
0 1
4 5
8 9

6{.'ab';'cde';'fghi'
+--+---+----++++
|ab|cde|fghi||||
+--+---+----++++
```

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