The inverse is not yet implemented. If it were, you'd be able to get i.4 5
from the following (for example), which you don't get from ,.&:>/ .
(1 0 0 1;1 0 1 0 0) <;.1 i.4 5
┌─────┬────────┐
│ 0 1│ 2 3 4│
│ 5 6│ 7 8 9│
│10 11│12 13 14│
├─────┼────────┤
│15 16│17 18 19│
└─────┴────────┘
On Wed, Nov 19, 2014 at 2:40 PM, Henry Rich <henryhr...@nc.rr.com> wrote:
> 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
>>>> ----------------------------------------------------------------------
>>>> For information about J forums see http://www.jsoftware.com/forums.htm
>>>>
>>>>
>>>
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