Hi Thomas, apologies for the length here, but you have asked a good question.
The operation to compose one verb with another is known as “atop” (as defined
on Pages 12 and 17 in the Arithmetic paper you are reading)… (this is called
function composition in linear algebra).
In 2002 I believe thi
Thanks David,
Good explanations. Just last week, it dawned on me that there are four
different meanings of [ , [ , ] and ] .
That makes tacit to explit more challenging .
Linda
Sent from my Verizon, Samsung Galaxy smartphone
Original message
From: David Lambert
Date
Am 05.05.2019 21:56 schrieb Henry Rich:
i.&1@< is not useful. Probably you mean i.&1@:<
Henry Rich
Hello Henry,
indeed I meant i.&1@< - it was given in the book I mentioned as an
example. I do see the point of i.&1@:< though, which definitely does
seem more useful.
Regards,
Thomas
i.&1@< is not useful. Probably you mean i.&1@:<
Henry Rich
On 5/5/2019 3:41 PM, Thomas Bulka wrote:
Am 05.05.2019 20:52 schrieb Roger Hui:
When applied dyadically, the verb finds the index of the first place
where
x is less than y
The verb is not very meaningful when applied monadically.
Am 05.05.2019 20:52 schrieb Roger Hui:
When applied dyadically, the verb finds the index of the first place
where
x is less than y
The verb is not very meaningful when applied monadically.
Hello Roger,
thank you very much for your quick reply. I think I got it now. But,
just a follow-up que
Thanks Bob,
Actually, mine is and adverb and yours is a verb!
f=:(0 ,.~ 0 ,. 0 ,~ 0 , ])^:[
f=: 13 :
4!:0 <'f'
1
g=: 4 : '(0 ,.~ 0 ,. 0 ,~ 0 , ])^:x y'
4!:0 <'g'
3
(3 g i.3 4)-:3 g i.3 4
1
Linda
-Original Message-
From: Programming On Behalf Of
Thanks - as long as you're aware of the feature!!!
Mike
On 05/05/2019 17:11, Eric Iverson wrote:
Mike,
Jd is developed by a team with a git repo. It is updated many times between
pacman releases. I gave up trying to sync pacman versions with git versions
with Jd wiki updates. The one that coun
When applied dyadically, the verb finds the index of the first place where
x is less than y
The verb is not very meaningful when applied monadically.
On Sun, May 5, 2019 at 11:31 AM Thomas Bulka wrote:
> Hello everyone,
>
> currently I work my way through Iverson's book on arithmetic, because
>
Task: write f explicitly.
f=:(0 ,.~ 0 ,. 0 ,~ 0 , ])^:[
We try substituting x and y for [ and ] .
g=: 13 :'(0 ,.~ 0 ,. 0 ,~ 0 , y)^:x'
2 g i. 2 3
|domain error: g
| (0,.~0,.0,~0,y) ^:x
We see failure with power.
We look up power in NuVoc
[x] u^:n y Fixed Power Conjunction
Hello everyone,
currently I work my way through Iverson's book on arithmetic, because
I'm interested in how J works as a mathematical notation. However, in
exercise B2 (Chapter 3), I struggle with a sentence, given as part of
the exercise:
cl =: i.&1@<
It seems to do the same as this senten
Your link to https://www.jsoftware.com/jd_tuts.html is very through, useful,
and deserves some serious study. (Wish I thought I was up to it!) Very nice
job.
> On May 4, 2019, at 6:07 PM, Eric Iverson wrote:
>
> Jd version 4.24 is available
>
> https://code.jsoftware.com/wiki/Jd/Release for
Mike,
Jd is developed by a team with a git repo. It is updated many times between
pacman releases. I gave up trying to sync pacman versions with git versions
with Jd wiki updates. The one that counts is the result of jd'list version'
and the docs in Jd wiki.
On Sun, May 5, 2019 at 4:15 AM 'Mike Da
Doh. padop can easily be a verb:
pad=: ];.0@((+$) {. ])^:2
2 1 pad&.> (i.2 3); i.2 2 2
+-+---+
|0 0 0 0 0 0 0|0 0 0 0|
|0 0 0 0 0 0 0|0 0 0 0|
|0 0 0 1 2 0 0|0 0 0 0|
|0 0 3 4 5 0 0|0 0 0 0|
|0 0 0 0 0 0 0| |
|0 0 0 0 0 0 0|0 0 0 0|
| |0 0 1 0|
|
Hi,
Not exactly an answer to the question, but rather a cute way to pad an array of
any rank using a cool feature of ;. cut that I ran into today.
From the dictionary:
u;.0 y applies u to y after reversing y along each axis; it is equivalent to (0
_1 */$y) u;.0 y .
Using this:
padop=: &((+
Thanks about Jd. However, I want to encourage new J users to install and use
it on phones and laptops.
I wish Download was easy to access for non-forum users.
(That nay come later.)
Linda
Sent from my Verizon, Samsung Galaxy smartphone
Original message
From: bill lam
D
The "real" Jd version is reported by
jd'list version'
4.24
Sun, 05 May 2019, jprogramming написал(а):
> Linda, Jd isn't the same as J; quoting from Package Manager's footnote,
>
> it's a "commercial database product" which requires a licence-fee. You can
>
> both install and update it usin
Linda, Jd isn't the same as J; quoting from Package Manager's footnote,
it's a "commercial database product" which requires a licence-fee. You can
both install and update it using Tools/Package Manager.
You can then do:
load'jd' NB. my typing, followed by two-line output:
!!! Jd key:
Hi Linda,
I think that the trick is that the left operand for ^: needs to be a verb. this
seems to work.
f=:(0 ,.~ 0 ,. 0 ,~ 0 , ])^:[
1 f i. 3 4
0 0 0 0 0 0
0 0 1 2 3 0
0 4 5 6 7 0
0 8 9 10 11 0
0 0 0 0 0 0
g=: 4 : '(0 ,.~ 0 ,. 0 ,~ 0 , ])^:x y'
1 g i. 3 4
0 0 0 0 0 0
0 0
Here's a simple function:
f=:(0 ,.~ 0 ,. 0 ,~ 0 , ])^:[
3 f i.3 4
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 1 2 3 0 0 0
0 0 0 4 5 6 7 0 0 0
0 0 0 8 9 10 11 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
But, oddly, I can't
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