The Dictionary does discuss this, at
http://www.jsoftware.com/help/dictionary/d530v.htm but unfortunately it
doesn't mention that the result of u is the atom number.
NuVoc in http://code.jsoftware.com/wiki/Vocabulary/curlyrtu#dyadic does
describe the case correctly, though without the usual examples because
the form is antiquated.
Henry Rich
On 12/28/2016 9:30 AM, Don Guinn wrote:
I played with x u}y some more. It seems that y is treated as a vector (rank
1) no matter what rank it actually is. x and u must be either rank 0 or 1
and both the same. Also then number of items in x must match the number of
items produced by u. Not sure what is going on. but it does not seem to
work as described in nuvoc. The vocabulary does not address this form at
all, just gerunds.
On Wed, Dec 28, 2016 at 6:33 AM, Cliff Reiter <[email protected]> wrote:
A long, long, time ago in a J far away, indexing was done in i. order. So
indices to a 3 by 2 array would be given by
i.3 2
0 1
2 3
4 5
Is it possible that x u}y is an artifact from that era?
On 12/27/2016 3:06 PM, Don Guinn wrote:
Just played with the original expression a little and got:
2 4 (0 2"_)}3 2$0
2 0
4 0
0 0
2 4 (0 3"_)}3 2$0
2 0
0 4
0 0
2 4 (0 4"_)}3 2$0
2 0
0 0
4 0
2 4 (0 5"_)}3 2$0
2 0
0 0
0 4
2 4 (0 6"_)}3 2$0
|index error
| 2 4 (0 6"_)}3 2$0
2 4 (0 _1"_)}3 2$0
2 0
0 0
0 4
On Tue, Dec 27, 2016 at 12:31 PM, Raul Miller <[email protected]>
wrote:
The verb form is different from the gerund form, for whatever reasons.
But this is documented in the dictionary (and in NuVoc, like Henry
mentioned earlier).
I'm not sure what other answer can be given, other than going into
detailed explanations of how they are different, and/or why both forms
are useful. Or, perhaps, if we need "moral justification", we could go
into examples of quirks in other programming languages (but all
programming languages have quirks - they seem to be unavoidable - so
that might be boring).
--
Raul
On Tue, Dec 27, 2016 at 2:20 PM, Brian Schott <[email protected]>
wrote:
This is what the OP needed, I think.
Except that instead of the u} form this is the gerund form.
So I don't think it is the answer, either.
2 4 [`(0 1"_)`]} 3 2$0
2 4
2 4
0 0
On Tue, Dec 27, 2016 at 2:09 PM, Henry Rich <[email protected]>
wrote:
I have removed the deprecation - it was my misunderstanding of something
Roger wrote.
The gerund form would be, in simplest form,
2 4 [`0:`]} 3 2$0
--
(B=)
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