Is the inverse implemented using ^:_1 ?  I couldn't find it.

I come up with ,.&:>/ as an inverse for ('';1)&(<;.1)  .

Henry Rich

On 11/19/2014 5:28 PM, Roger Hui wrote:
The inverse of this "block matrices cut" is also interesting.


On Wed, Nov 19, 2014 at 2:27 PM, Roger Hui <rogerhui.can...@gmail.com>
wrote:

    ('';1) <;.1 i.3 3
┌─┬─┬─┐
│0│1│2│
│3│4│5│
│6│7│8│
└─┴─┴─┘


On Wed, Nov 19, 2014 at 2:05 PM, Henry Rich <henryhr...@nc.rr.com> wrote:

    boxcols i. 3 3
+-+-+-+
|0|1|2|
|3|4|5|
|6|7|8|
+-+-+-+

Can you write boxcols?

Can you write it tacitly without using a hook, fork, compose, or appose?

Henry Rich
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