Thank you to everyone who responded.  A further question:  do you prefer
that the cells be ordered by their occurrence in x, or do you prefer that
they be sorted (by x)?


On Mon, Apr 15, 2013 at 5:43 PM, Roger Hui <[email protected]>wrote:

> I have a question concerning your use of *key*.  Do you find yourself
> wishing that in x f/.y, the f would be invoked with a left argument which
> is key value corresponding to the items in the right argument?  This does
> not mean that the J definition or implementation will be changed, but to
> find out that if I have an opportunity to define/implement key in another
> context ;-) whether I should consider changing it.
>
>
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