Left R←X⊣Y

X and Y may be any arrays.

The result R is the left argument X.

Example

      42⊣'abc' 1 2 3
42

Note that when ⊣ is applied using reduction, the derived function selects the first sub-array of the array along the specified dimension. This is implemented as an idiom.

Examples

      ⊣/1 2 3
1

      mat←↑'scent' 'canoe' 'arson' 'rouse' 'fleet'
      ⊣⌿mat  ⍝ first row                          
scent
      ⊣/mat  ⍝ first column                       
scarf

      ⊣/[2]2 3 4⍴⍳24 ⍝ first row from each plane
 1  2  3  4
13 14 15 16

Similarly, with expansion:

      ⊣\mat
sssss
ccccc
aaaaa
rrrrr
fffff
      ⊣⍀mat
scent
scent
scent
scent
scent