More specifically than rank, I'd say the important concept introduced was frame/cell, or more precisely the idea that ever array is a list of its items, recursively (i.e. the reliability of _1 cells).
This is the idea underlying #y (which APL lacked), and made the rows the primary axis of a J table, in contrast to APL's default/primary/non-"bar" axis of the columns, for example. -Dan Please excuse typos; composed on a handheld device. -----Original Message----- From: Zsbán Ambrus <[email protected]> Date: Tue, 2 Mar 2010 11:02:36 To: Chat forum<[email protected]> Subject: Re: [Jchat] Multiple cores On Mon, Mar 1, 2010 at 11:55 PM, Roger Hui <[email protected]> wrote: > The next major change came in July 1990 when > J redefined , to denote the computation usually > denoted by comma-bar in APL. That's only because J introduced rank instead of brackets. The insert operator has changed in a similar way: slash in J means what slash-bar means in APL. Ambrus ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
