I've been trying to remember Newton's Method and I came upon this:
f=: 13 :'(A=:1 + ] - *:)N^:y]1'
f
3 : '(A=:1 + ] - *:)N^:y]1'
f 4
1597r987
A 4
_11
_11 N^:4]1
|nonce error: N
| -u%u d.1
It has been such a long time since I have seen a nonce error that I thought
it
You have asked "please pounce on my errors" and I am waiting for an
extraction process to complete. So:
On Tue, Feb 25, 2014 at 1:12 AM, David Lambert wrote:
> Trains have infinite rank, that's why we cannot consider a single verb as
> a train.
I agree that trains have infinite rank, but usual
j is a multiple instruction single data language and has many many ways
to pass data, including as far as I can tell all combinations of
monadic, dyadic verbs considering single verbs, their obverses where
practical, the trains of even numbers of verbs, and of odd numbers of
verbs with more tha
On Mon, Feb 24, 2014 at 10:27 PM, Jon Hough wrote:
> {: 3 p: 567That works fine.OK, so I want to wrap that into a tacit
> verb.Here was my first attempt:
> bigdiv =. {: 3 p:|syntax error| bigdiv=.{:3 p: I am not sure why
> this fails. Apparently we need a & between the two verbs "{:" and
This seems simpler. The first thing to do is build a prototype implementaton,
and then we can see what are other problems out there.
Пн, 24 фев 2014, Don Guinn писал(а):
> A middle ground might be to allow for some Unicode (UTF-8) to be
> considered letters like a-z,A-Z. Then one could name APL
A middle ground might be to allow for some Unicode (UTF-8) to be
considered letters like a-z,A-Z. Then one could name APL iota to something
like i. . In addition, it would allow non-English languages not be
restricted to ASCII characters for names. Greek letters in mathematics
could be used as na
(continue..)
Monad ;: already can distinguish strings and primitives.
;: 'f=: ''i.''&i.'
+-+--++-+--+
|f|=:|'i.'|&|i.|
+-+--++-+--+
Вт, 25 фев 2014, bill lam писал(а):
> If internal representation is only visible in 5!:x conjunction,
> perhaps we can keep original 5!:x that print ascii
If internal representation is only visible in 5!:x conjunction,
perhaps we can keep original 5!:x that print ascii and add some
new 5!:(10+x) to print APL glyph.
Пн, 24 фев 2014, Roger Hui писал(а):
> Don't go there. Let's say you have some internal representation for
> index-of. What do you out
You're trying to make a tacit version of:
{: 3 p: 567
3&p: is the verb you could bind to. And:
{:@(3&:p)
You can always ask for hint/solution by:
13 : '{: 3 p: y'
[: {: 3 p: ]
- Original Message -
From: Henry Rich
To: programm...@jsoftware.com
Cc:
Sent: Monday, February 24,
Don't go there. Let's say you have some internal representation for
index-of. What do you output for 5!:5 <'f' where f=: 'i.'&i.? Would that
result have different lengths at different times? Would the character
string 'i.' in the definition of f be stored as the ASCII characters 105
and 46?
I can't see any newlines in this post, so it's very hard to see what was
executed. everything runs together.
Henry Rich
On 2/24/2014 10:27 PM, Jon Hough wrote:
As a beginner in J, I am attempting to get a footing in tacit verbs.Lots of
things still confuse me, so I want to go through my tria
I guess J can support both ascii and APL glyph as primitives by
modifying the c source code for monad ;: and map both ascii and
APL glyph to the same internal representation token for the
primitives.
Since J is script-based, J itself does not need to concern how
APL character will be input or outp
As a beginner in J, I am attempting to get a footing in tacit verbs.Lots of
things still confuse me, so I want to go through my trial-and-error working,
and hopefully, if someone has the time, they can explain some things to me.
First I wanted to find the largest prime divisor of a given number
On further testing, it seemed the problem was un-related to
safari, sorry for the noise.
Вс, 23 фев 2014, bill lam писал(а):
> On my iphone 3gs (iOS5), using it safari browser, I can connect
> to jhs jijx, jijxm, jijxm, the page can show but once typing
> anything for execution, from ~user/.applo
jqt has been updated to 1.0.24 and qt addon to 1.0.143, these
two versions must be used together. install'jqt' inside
jconsole will update both of them at the same time.
For those installed by windows installer, either using the
install'jqt' or installing the updated installer will
both work.
Fo
There has been some nice work in other areas to support keyboards. The
following page uses that work to provide an APL keyboard.
http://home.comcast.net/~paul.l.jackson/APL.js/
If you know the APL keyboard, just type ` followed by a normal character
and an APL character will appear.
If you don'
There has been a dns problem and fixed now.
On Feb 25, 2014 4:54 AM, "Jan-Pieter Jacobs"
wrote:
> I also had a timeout in the afternoon, but now things seem to work ...
>
>
> 2014-02-24 20:28 GMT+01:00 Kenneth Lettow :
>
> > No problems here.
> >
> >
> > On Mon, Feb 24, 2014 at 11:29 AM, John Bak
Thanks. Ctrl-Shift-C worked great.
On Mon, Feb 24, 2014 at 7:21 AM, Raul Miller wrote:
> On Mon, Feb 24, 2014 at 8:30 AM, Don Guinn wrote:
> > (Had to add spaces to get the lines with blanks to line up. For some
> reason
> > copying and pasting from J likes to compress leading blanks.)
>
> If
I also had a timeout in the afternoon, but now things seem to work ...
2014-02-24 20:28 GMT+01:00 Kenneth Lettow :
> No problems here.
>
>
> On Mon, Feb 24, 2014 at 11:29 AM, John Baker wrote:
>
> > Is anyone else experiencing problems accessing www.jsoftware.com today?
> >
> > I am getting a w
I think you joined it about 20 minutes after I posted my message.
http://jsoftware.com/pipermail/chat/2014-February/005754.html
and 10 minutes after
http://jsoftware.com/pipermail/chat/2014-February/005755.html
See also: http://jsoftware.com/pipermail/chat/2014-February/date.html
FYI,
--
Rau
Dan,
If someone can provide me with a clean compiling 64 bit windows GPL source
package, I would be happy to apply the patches and host the binary at
http://www.2bestsystems.com/foundation/j/
On Mon, Feb 24, 2014 at 1:23 PM, Dan Bron wrote:
> This is tailor-made Dan-bait. I need some time to
I wrote:
> There are also ways to use u without explictly inspecting or switching on
> its nameclass, but these are use-case specific, obviously.
>
> If you post your fuller use-case or current adverb, we might be able
> to help you minimize bookkeeping on the argument's nameclass.
I re-read you
thank you Dan, enjoyed all the tips.
I realized that going from verb or noun to noun is pretty straightforward with
u"_ , and it was turning a noun as the basis for a verb that I had not
previously done before, and so understandably slightly more hoop jumpy.
One huge benefit of single lines for
Ok. I just joined it. Thanks for the prod.
Raul Miller wrote:
Let's take this to the chat forum... (I'm composing for the chat forum now.)
--
For information about J forums see http://www.jsoftware.com/forums.htm
Pascal wrote:
> '+: y' (1 : 'if. isNoun ''u'' do. u =. (13 : u) end. u ') 3
> NB. TIL you can add code after 'end.' on same line.
The reason you can put 'end.' on the same line is that in an explicit
context (i.e. running under : ), 'end.' is considered punctuation, as is
any control word. T
In this instance Newton's method gives the same results as the following (
http://www.jsoftware.com/jwiki/Essays/Fibonacci%20Sequence#Matrix_power):
M=: 0 1,:1 1x
+/ .*~^:5 M
1346269 2178309
2178309 3524578
% %/ {: +/ .*~^:5 M
3524578r2178309
(1 + ] - *:) N^:5 ] 1
3524578r2178309
No problems here.
On Mon, Feb 24, 2014 at 11:29 AM, John Baker wrote:
> Is anyone else experiencing problems accessing www.jsoftware.com today?
>
> I am getting a web page not available. Mind you it could be our corporate
> network ninnies that are always blocking websites without reason or
> w
Let's take this to the chat forum... (I'm composing for the chat forum now.)
Thanks,
--
Raul
On Mon, Feb 24, 2014 at 2:00 PM, PMA wrote:
> I'd love to hear -- putting aside implementation issues, people's aversion
> to the unfamiliar, and what is or isn't ugly -- how the list members would
> e
For computational purposes, I favor primitive recursion
(http://en.wikipedia.org/wiki/Primitive_recursive_arithmetic) over
elementary recursion
(http://en.wikipedia.org/wiki/Elementary_recursive_arithmetic).
Still, I thought I'd post an explicit implementation of Recursion. I
understand that being
I'd love to hear -- putting aside implementation issues, people's aversion
to the unfamiliar, and what is or isn't ugly -- how the list members would
expect adoption of APL chars to impact (enhance/ruin/...) J.
Roger Hui wrote:
I love the APL chars as much as the next guy. Some people would arg
This is tailor-made Dan-bait. I need some time to study it (this is the
first email I've physically printed out - on paper - in years!), but even
on a first inspection there's some exciting ideas here . This one already
has some wheels turning in my mind:
> Is there any benefit for defining adve
That's the basic pattern.
The name 'u' refers to the adverb's argument, so it will always exist and
be either a verb or a noun. If the adverb is passed a verb, then u will
exist and be a verb; if the adverb is passed a noun, then u will exist and
be a noun.
In addition to u, if the adverb is p
I love the APL chars as much as the next guy. Some people would argue that
APL chars are no longer a problem, but recent experience with my Samsung
tablet indicates otherwise.
On Mon, Feb 24, 2014 at 8:27 AM, Raul Miller wrote:
> Maybe I should be doing this in a different forum? It's hard to
Here is how I would generate the terms of the finite continued fraction
1 + 2
--
3 + 4
--
5 + 6
--
7
cf =: {.@] , {.@] + [: ([: %`+/ 0 ,~ ,/)\ (,. }.)
2 4 6 cf 1 3 5 7x
1 5r3 29r19 233r151
The underlying idea
Someone could edit the J interpreter such that when you type a
combination of characters, it will replace them with a better, one
character alternative. The question is if people want this to be only
visual or actually change what you've typed in.
On Mon, Feb 24, 2014 at 11:27 AM, Raul Miller wro
Maybe I should be doing this in a different forum? It's hard to
anticipate if or where conversation will go.
Anyways, http://www.johndcook.com/symbols/2014/02/apl/ reminded me to
think about the tradeoffs involved in J's design:
thru=: [ + 1 i.@+ -~
10 thru 20
10 11 12 13 14 15 16 17 18 19
okay from here ...
-Dan
On 24 Feb 2014, at 09:29, John Baker wrote:
> Is anyone else experiencing problems accessing www.jsoftware.com today?
>
> I am getting a web page not available. Mind you it could be our corporate
> network ninnies that are always blocking websites without reason o
For some reason, I remember there was an easier way to get an adverb to notice
whether it had an m or u parameter, but I can't recall if that was the case, or
how to do it. Is there an easier way to write the adverb below?
isNoun =: (0 = 4!:0 ( :: 0:))@:<
2 (1 : 'if. isNoun ''u'' do. u
Is anyone else experiencing problems accessing www.jsoftware.com today?
I am getting a web page not available. Mind you it could be our corporate
network ninnies that are always blocking websites without reason or warning.
Cheers
--
John D. Baker
bakerj...@gmail.com
On Mon, Feb 24, 2014 at 8:30 AM, Don Guinn wrote:
> (Had to add spaces to get the lines with blanks to line up. For some reason
> copying and pasting from J likes to compress leading blanks.)
If you are using chrome, try the right click option: "Paste as plain
text" (or control-shift-v).
Thanks,
Extended integers seems to work on base ten thousand. On J8 64 bit I get
3!:3&.>1x;1x;1x
++++
|e300|e300|e300|
|4000|4000|4000|
|0100|01000
Another nice way to get a lot of digits from the golden ratio is using Newton's
Method.
In : http://www.jsoftware.com/jwiki/Essays/Newton%27s%20Method
N=: 1 : '- u % u d. 1'
correct50 =: '1.61803398874989484820458683436563811772030917980576'
0j50 ": (1 + ] - *:) N^:7 ] 1
1.6180339887498948482
Here is the number from the web page you included.
NB.0.6180339887 4989484820 4586834365 6381177203 0917980576 2862135448
6227052604 6281890244 9707207204 1893911374
Your function provides a decimal value. The result here is a rational
number:
g=: 13 :'(+%)/\y$1x'
]B=:0{|.g 300
I'm glad there are people like you who are worried about all this. I'm quite
content to use J as a powerful calculator which has provided 50 digits of the
Golden Ratio. Unless I hear otherwise, I will continue to trust it is providing
correct answers. I wish you all the best as you work to mak
Aww... tricky send button.
Corrections:
digits_g =: 0j50 ": B - 1 NB. and
digits_g -: 52{.(#~ ' ' ~: ]) dw
Jan-Pieter
2014-02-24 11:32 GMT+01:00 Jan-Pieter Jacobs :
> It seems they are the same as on this page:
> http://home.adelphi.edu/~stemkoski/mathematrix/constant.html
> Atleast for the f
It seems they are the same as on this page:
http://home.adelphi.edu/~stemkoski/mathematrix/constant.html
Atleast for the fractional part.
g=: 13 :'(+%)/y$1x' NB. removed the \ making things slower, only returning
the last result
]B=: g 200
digits_g =: 0j50 ": B
NB. first 100 digits from the webs
Jose, I had a vague fuzzy feeling that my method wasn't recursion. I'll go
back to read your original message more carefully.
Linda
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Jose Mario
Quintana
Sent
Ric, are these 50 digits correct. Is it doing the "long division" to get
the answer?
Linda
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Linda Alvord
Sent: Monday, February 24, 2014 5:01 AM
To: programm...
Nice. This is all it takes in a fresh start in J:
g=: 13 :'(+%)/\y$1x'
]B=:0{|.g 200
453973694165307953197296969697410619233826r280571172992510140037611932413038
677189525
0j50 ": B
1.61803398874989484820458683436563811772030917980576
Is this the same j of complex numbers or is
Yes! Thanks, Kip.
g=: 13 :'(+%)/\y$1x'
0{|.g 200
453973694165307953197296969697410619233826r280571172992510140037611932413038
677189525
_1 x: 0{|.g 200
1.61803
Linda
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jso
No need to convert to floating point first:
0j42 ": 5r3
1.67
On Mon, Feb 24, 2014 at 8:32 PM, km wrote:
> Floating point digits beyond the 17th are illusory on my 32-bit machine:
>
> 0j42 ": x:^:_1 [ 5r3
> 1.66674068153497501043602
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