Marshall has the last word on this.
Henry Rich
On 10/18/2020 7:41 PM, 'Pascal Jasmin' via Programming wrote:
(8&-) b._1 NB. normal to think this is weird
8&-
(-&5) b._1 NB. normal to think this is not weird, and normal to think both
should be consistent.
5&+
What I think is the most natural would be the "radical": 8&+ result for the
first expression.
(8&(-~)) b._1
8&+
Note that */+ gets it right, and %/- "wrong"
(8&%) b._1
8&%
(8&%) b._1
(*&8) b._1
0.125&*
(8&*) b._1
0.125&*
On Sunday, October 18, 2020, 06:40:35 p.m. EDT, Jose Mario Quintana
<[email protected]> wrote:
I fail to see what the big issue regarding
8 -inv 5
3
is.
Since x u^:n y is equivalent to (x&u)^:n y then 8 (-^:_1) 5 is
equivalent to (8&-^:_1) 5, and the inverse of 8&- is itself, one
can do the math or just ask J,
(8&-) b._1
8&-
Thus,
(8&-)5
3
Am I confused?
On Sun, Oct 18, 2020 at 6:03 PM Henry Rich <[email protected]> wrote:
I agree that - : (-~) might be a better obverse. If there is only one
inverse, it is for the monad.
I like the idea of more documentation - care to add it to NuVoc?
Henry Rich
On 10/18/2020 6:00 PM, Raul Miller wrote:
Yes, that represents the expectation and the implementation. But I am
not seeing how there's any inverse here, for the dyadic case.
- b. _1
-
Personally I would expect either
- : +
or
- : (-~)
or some writeup explaining the thinking that makes the current
implementation the right approach.
Thanks,
--
Raul
On Sun, Oct 18, 2020 at 5:49 PM Henry Rich <[email protected]> wrote:
(-&5 inv) 8
13
(8&- inv) 5
3
You are thinking it does the first, but it does the second.
Henry Rich
On 10/18/2020 3:27 PM, David Lambert wrote:
JVERSION
Engine: j902/j64avx2/linux
Beta-h: commercial/2020-10-03T19:37:53
Library: 9.02.05
Platform: Linux 64
Installer: J902 install
InstallPath: /home/lambertdw/downloads/installs/j902
Contact: www.jsoftware.com
NB. huh? 13 looks right to me.
8 -inv 5
3
NB. expected
8 *inv 5
0.625
8 +inv 5
_3
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
--
This email has been checked for viruses by AVG.
https://www.avg.com
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
--
This email has been checked for viruses by AVG.
https://www.avg.com
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
--
This email has been checked for viruses by AVG.
https://www.avg.com
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
