Lately, I find myself repeatedly comparing pairs in arrays.
I usually do something like:
d =: 3 : '-/1 }. y ,. 0 , }: y'
d i. 5
1 1 1 1
It feels like I'm reinventing the wheel but I couldn't find a simpler way
(and more efficient for large arrays) to apply u over each pair of v.
Is there
9
┌───┬───┬───┬───┬───┐
│3 1│1 4│4 1│1 5│5 9│
└───┴───┴───┴───┴───┘
2 -/\ 3 1 4 1 5 9
2 _3 3 _4 _4
On Fri, Aug 14, 2015 at 7:30 AM, Yoel Jacobsen yoel.jacob...@gmail.com
wrote:
Lately, I find myself repeatedly comparing pairs in arrays.
I usually do something like
I tried to follow Dan Baronet's A tool of thought in the latest Vector
(26, 23). It's about solving Kankuro puzzles:
Find all sets of N unique positive single digit numbers (1..9) making the
sum S.
I tried from scratch with J:
sol =: dyad define
p =. (i.!9) A. : i. 9
c =. ~. /:~1 (x {.1 p)
k
Ns=: +/1 *sets
sol=:4 :0
0 -.1~ sets #~ (x=Ns)*y=sums
)
4 sol 12
1 2 4 5
1 2 3 6
timespacex '4 sol 12'
2.8e_5 9472
timespacex '9 sol 45'
1.6e_5 8960
Seems efficient enough to me?
Thanks,
--
Raul
On Sat, Aug 8, 2015 at 4:12 PM, Yoel Jacobsen yoel.jacob...@gmail.com
if you were already working with sorted data, you
could eliminate the @/:~
Thanks,
--
Raul
On Tue, Jul 28, 2015 at 12:57 PM, Yoel Jacobsen yoel.jacob...@gmail.com
wrote:
Hello,
Long list of questions, apology in advance...
I'm playing with Jd by trying to use it as an analytical
Brian,
I wasn't aware of 13: . Thank you.
Yoel
From Brian Schott schott.br...@gmail.com
Have you tried the 13 : feature like this?
13 : '(x .@* :@# y){/:~y'
([ .@* [: :@# ]) { [: /:~ ]
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Brian Schott
8, 2015 at 4:32 PM, Yoel Jacobsen yoel.jacob...@gmail.com
wrote:
Hello there,
Is there a way to combine preemption, checkpointing and automatic requeue?
The behavior I try to configure is:
- Submit a batch job with checkpointing (based on BLCR)
- On preemption - take a checkpoint and kill
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How can I append each element of the RHS list to each element of the LHS list?
Example:
a =. 1 2 3
b =. 10 20 30
I would like a to achieve: a something b that will result in:
1 10 1 20 1 30
2 10 2 20 2 30
3 10 3 20 3 30
I have experimented with ,. and ,: without success.
What did I miss?
Thank you.
I eventually did this:
a ,@,.(0 _) b
Yoel
On Fri, Feb 15, 2008 at 9:18 AM, Chris Burke [EMAIL PROTECTED] wrote:
Yoel Jacobsen wrote:
How can I append each element of the RHS list to each element of the LHS
list?
Example:
a =. 1 2 3
b =. 10 20 30
I would
This 'apply' should be added to the phrases doc...
Thanks!
On Jan 17, 2008 6:23 PM, Dan Bron [EMAIL PROTECTED] wrote:
Yoel wrote:
Is there a way for instance, to apply ;:'[ [ |:' to (i.10 10);(i. 10
10); i.10 10 ?
Jose responded:
(']';']';'|:') apply . T
The master struck the
Hello,
I want to implement matrix approximation using SVD.
The SVD algorithm returns three boxed matrices of the shapes x x ; x y ; y y
I want to chop and multiply back:
Step 1: reshape as - x M; M M ; M y where M is a small value
Step 2: Unbox and multiply (x M * M M * M y = x y)
My current
Hello,
It seems to me that the SVD implementation from
~system\packages\math\svd.ijs is inefficient for large matrices (i.e.
calculating the SVD of the color matrices of an 640x500 image never
ends..).
You may even try: $ svd i. 200 200
(in NumPy it takes less than a second)
Before I reinvent
I have tryed it on a 1.2GB file. Since my laptop has only 1GB RAM I have
killed the process when it consumed 500MB (and rising).
Yoel
On 5/15/06, Henry Rich [EMAIL PROTECTED] wrote:
Try
x ([: I. E.) y
--
For information
'sizes =: delim (_1: . (] i.1 [) {.0 1 ]) (tagis +/
(#tag)+i. 12){mls'
0.431585 1.37452e7
$sizes
43947
+/ x: sizes
11572953524
Maybe these are some ideas you can use to attack your problem.
- joey
At 11:01 +0300 2006/05/14, Yoel Jacobsen wrote:
Hello,
I'm new to J so please forgive me
Some of the clients of the company I'm working for, are working with up to
Terabyte-long files. Usually in Physics, life-science,simulation etc.
The new file system in Solaris (ZFS) is a 128bit FS.
Anyway, data mining from log files is an important use of a language for me.
I am very pleased
Hello,
I'm new to J so please forgive me if this is a FAQ.
I wrote some short sentences to parse a log file. I want to retrieve all the
unique values of some attribute. The way it shows in the log file is
attribute nameSPACEattribute value such as . csn 92892849893284
...
My initial (brute
2006/5/14, Yoel Jacobsen [EMAIL PROTECTED]:
Hello,
I'm new to J so please forgive me if this is a FAQ.
I wrote some short sentences to parse a log file. I want to retrieve all
the
unique values of some attribute. The way it shows in the log file is
attribute nameSPACEattribute value
Even for regex, I don't see how to avoid manually reading the file in chunks
which is too imperative style for me. Again, consider the Python example:
for line in file.readlines():
match_object = re.search((= csn )\w+, line)
if match_object:
process(match_object.group(0))
The regex can be
),(DateOfCallString,20050315)]),(SVCL,[(CustomerName,TWO
x),(CustomerID,10301),(CallTypeCode,MRP2),(DateOfCallString,20050329)]),(USGE,[(CustomerID,10301),(CustomerName,TWO
x),(Cycle,7),(ReadDAte,050329)])]
*Main
Yoel Jacobsen wrote:
It seems that Martin Fowler's article Language
Hi David,
Thank you for the reference. The problem with this attitude is that the
configuration structure is static. I would like to be able to construct
the record structure dynamically from the configuration file..
Yoel
David Menendez wrote:
Yoel Jacobsen writes:
It seems that Martin
It seems that Martin Fowler's article Language Workbenches: The
killer-App for Domain Specific Languages? -
http://www.martinfowler.com/articles/languageWorkbench.html - has
generated some nice dynamic solution where a configuration file is
written in the same language as the program. Notable
Hello,
I have a weird situation. I've defined a clean and short XF86Config
file. It defines two modes 1152x864 and 1024x768 and a single 16 bit
Display.
The weird thing is that it is works perfectly with kernel 2.4.x and
with the 2.2.19 supplied with potato it fails telling me the
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