I would rather say that the implementation has a quirk: it treats the
names 'x' and 'y' in some cases to refer to u and v. This is a
regrettable artifact from early J, required to keep old code working,
and not to be relied on in new code.
Henry Rich
On 12/4/2015 7:11 AM, bill lam wrote:
It is more accurate to say u v and x y since x y can be used in as u v in
the absence of any u v.
of1=: 2 : 'y@[ x y@]'
+ of1 *:
*:@[ + *:@]
On Dec 4, 2015 6:11 PM, "Henry Rich" <[email protected]> wrote:
Kip's version doesn't refer to x or y directly. This is an important
improvement. The body of Kip's conjunction is executed BEFORE the x and y
arguments are seen:
of =: 2 : 'v@[ u v@]'
+ of *:
*:@[ + *:@]
This is not true of the original form:
fxgfy=: 2 : 0
:
(v x) u v y
)
+ fxgfy *:
+ (2 : (':'; '(v x)u v y')) *:
Henry Rich
On 12/4/2015 1:19 AM, Kip Murray wrote:
And you can use a fork in the definition of a conjunction:
of =: 2 : 'v@[ u v@]'
4 + of *: 5
41
On Thursday, December 3, 2015, Kip Murray <[email protected]> wrote:
A fork is not a conjunction but it shows what you are doing:
4 (*:@[ + *:@]) 5
41
On Thursday, December 3, 2015, Lippu Esa <[email protected]
<javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:
It is 5:17 AM in Finland and I already have two good answers. Thank you
David and Pascal!
It seems that I haven't been using Compose either :) . But at least I
knew that this is the place to be.
Thanks again,
Esa
-----Original Message-----
From: [email protected] [mailto:
[email protected]] On Behalf Of David Lambert
Sent: perjantaina 4. joulukuuta 2015 5.14
To: programming <[email protected]>
Subject: Re: [Jprogramming] My first J conjuction
I expect you'll get many of the same response. Your conjunction is
fine, however this particular case is so frequent there's a built in
conjunction. Read "but first",
x f&g y
or
x f&:g y
the difference being rank. Add but first square:
4 +&: *: 5
41
On 12/03/2015 10:05 PM, [email protected] wrote:
Date: Fri, 4 Dec 2015 03:05:50 +0000
From: Lippu Esa<[email protected]>
To:"[email protected]" <[email protected]>
Subject: [Jprogramming] My first J conjuction
Message-ID: <4C1D3F3685BCAE4699AA47F9961903BA33126CC3@VDOMES02>
Content-Type: text/plain; charset="us-ascii"
Hello everybody,
I realized with some shame that I haven't written a single J
conjunction - ever. Some adverbs, yes, but they too are newish.
I have a recurring need for sentences like (f x) g f y where verb f is
applied to nouns x and y and dyadic verb g is then applied to the two
results.
and was thinking of something like x f c g y with c being a conjuction.
This is what was the result:
fxgfy=: 2 : 0
:
(v x) u v y
)
4 + fxgfy *: 5 NB. very simple example
4 + fxgfy *: 5
41
Is there a more natural J way to do this? What would be a good name for
this type of conjunction or operation?
Esa
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