[Bug-apl] ⊢[X]

[Juergen Sauermann]

Hi,

I have added a new primitive function variant: ⊢ with axis.
⊢ with axis selects, according to its axis argument, its left argument, or
its right argument, or a mix of items from both arguments:

      A←2 3⍴'abcdef'         ⍝ left value
      B←2 3⍴⍳6               ⍝ right value
      X←2 3⍴0 1 0 1 0 1      ⍝ left/right selector

      A ⊢ [0] B
abc
def

      A ⊢[1] B
1 2 3
4 5 6

      A ⊢[X] B
a 2 c
4 e 6

   A ⊢[X] '*'
a*c
*e*

   '*' ⊢[X] B
* 2 *
4 * 6

That way hard to read →() / Label: constructs for the selection of different values according
to a condition can be avoided.

SVN 1071.

/// Jürgen

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