Take: Difference between revisions

The following [[dfn]] models Take as defined by [[Dyalog APL]] but with no axis specification or error checking. It is implemented by construction a [[nested array]] of indices and using these to select from the right argument, with prototypes used for out-of-range indices. It explicitly includes [[scalar rank extension]] for the right argument and the SHARP APL extension; if these extensions are not wanted those lines can be removed. [[Scalar rank extension]] of the left argument is inherited from [[Iota]] and [[scalar function]] extension.

This definition could be converted to work in a [[Flat array model|flat]] APL with the [[Rank operator]] by using an [[odometer function]] like <code>⊢⊤(⍳×/)</code> in place of [[Iota]] and changing the two subsequent uses of [[Each]] to Rank 1.