The plan is that segmented strings are the data in the database.
There's just too much information to hold it all in memory on a single
machine.
Thanks,
--
Raul
On Wed, Apr 9, 2014 at 2:23 AM, Linda Alvord wrote:
> I know almost nothing about large databases, but what is the advantage of
> s
I know almost nothing about large databases, but what is the advantage of
staying with sstrings after the data base is built?
Once you have your table, or maybe two or more tables of character and numeric
data, you might "stay in J and make "subtables" which can be catenated together
and destro
sorry- I originally used + which duplicated 15 where I should have
used or (+. )
On 08/04/2014 8:52 PM, Don Kelly wrote:
try=: 3 : '( (0=3|y)+.(0=5|y))#y' **or** try1=: ] #~ (0 = 3 | ]) +. 0
= 5 | ] *
*
try1 1+i.19
3 5 6 9 10 12 15 18
Don Kelly
On 08/04/2014 8:30 AM, Jon Hough wrote:
try=: 3 : '( (0=3|y)+.(0=5|y))#y' **or** try1=: ] #~ (0 = 3 | ]) +. 0 =
5 | ] *
*
try1 1+i.19
3 5 6 9 10 12 15 15 18
Don Kelly
On 08/04/2014 8:30 AM, Jon Hough wrote:
Euler Project #1 is:If we list all the natural numbers below 10 that are
multiples of 3 or 5, we get 3, 5, 6 and 9. The
I might indeed do that, but in some cases the time to read the file itself
will be mostly network transfer time. And, once it's in memory, how it got
there isn't really an issue.
Still, it's worth benchmarking.
Thanks,
--
Raul
On Tue, Apr 8, 2014 at 8:18 PM, Vijay Lulla wrote:
> I second me
I second memory mapped files and mapped file database.
On Tue, Apr 8, 2014 at 4:51 PM, Raul Miller wrote:
> It's available for free now, with some limitations:
>
> http://kx.com/software-download.php
>
> It'll take me a few years, though, to develop a fluency in K (Q actually,
> or kdb+ ...) wh
A pencil and paper solution.
A problem with computers is that it is too easy to go for a brute-force
solution. Computers are great for solving problems with no simple solutions
by applying brute-force, but this isn't one.
The problem with adding together all multiples of 3 and 5 in the series 0
.
It shouldn't matter where J is installed, so it sounds like your reinstall
fixed an earlier problem.
On Wed, Apr 9, 2014 at 5:30 AM, Ray Zhao wrote:
> Ok, so I reinstalled J in the HOME folder instead of system and the
> problem's solved now. I guess I really have to read throughout the actual
evoke6=: evoke&6
eval2 =: 'evoke6 @: <' apply ]
+:(eval2'@')+/1 2 3
22
+:( eval2']')+/1 2 3
12
+:( eval2'4:')+/1 2 3
8
note that it only works for verbs/modifiers. domain error for nouns, and also:
+:( eval2'4"_')+/1 2 3
|domain error
but:
a=. 4"_
+:( eval2'a')+/1 2 3
Ok, so I reinstalled J in the HOME folder instead of system and the
problem's solved now. I guess I really have to read throughout the actual
site more...
--
For information about J forums see http://www.jsoftware.com/forums.htm
I think so; actually, I would say it is even more related to the exact
value of 1/3 as a binary number:
0.01010101010101010101010101...
On Tue, Apr 8, 2014 at 12:00 AM, Don Kelly wrote:
> Ah, then the question is that when the trains are exactly opposite to one
> another- where is the fly- hal
The path you're showing does not look like the one that pacman installs to,
at least not on my Windows machine: I see "plot.ijs" under "C:\Program
Files (x86)\j64-701\addons\graphics\plot".
On Tue, Apr 8, 2014 at 5:09 PM, Ray Zhao wrote:
> Hi Chris, I have tried this method of reinstalling the
That is right,
evoke=. (<'`:')(0:`)(,^:)
'evoke&6 @: <' apply '@'
@
This is not suitable for the purposes that Pascal has in mind (that is an
ideal job for wl (104!:1)); but, apply can return any kind of words.
"To see and listen to the wicked is already the beginning of wickedness."
;)
Hi Chris, I have tried this method of reinstalling the addons using
tools->package manager in admin mode, but I still get the same error. The
ijs file is installed in a folder different than that from the one JQt is
actually searching in:
load 'C:/Program Files/j801/graphics/plot/plot.ijs'
not fo
It's available for free now, with some limitations:
http://kx.com/software-download.php
It'll take me a few years, though, to develop a fluency in K (Q actually,
or kdb+ ...) which approaches my fluency in other languages. Anyways, it's
not at all clear that K (or Q or KDB+) would be any better f
It may help if you knew how fork came about.
http://keiapl.org/rhui/remember.htm#fork0 http://keiapl.org/anec/#nvv It
was a long struggle. The triple aspect is integral to the idea.
On Tue, Apr 8, 2014 at 12:09 PM, Joe Bogner wrote:
> On Tue, Apr 8, 2014 at 11:48 AM, Jan-Pieter Jacobs <
>
On Tue, Apr 8, 2014 at 11:48 AM, Jan-Pieter Jacobs <
janpieter.jac...@gmail.com> wrote:
[snip]
> Other things to note are : you can use a for for dummy, and instead of
> multiplying with 1, it's easier to use the identity function (which, as a
> bonus works also for non-numeric types). Now a fork
I think I would pay for k's database capability. --Kip Murray
Sent from my iPad
> On Apr 8, 2014, at 12:46 PM, Björn Helgason wrote:
>
> I would take a look at the mapped file database lab to get ideas.
>
> -
> Björn Helgason
> gsm:6985532
> skype:gosiminn
>> On 8.4.2014 15:34, "Raul Miller"
I would take a look at the mapped file database lab to get ideas.
-
Björn Helgason
gsm:6985532
skype:gosiminn
On 8.4.2014 15:34, "Raul Miller" wrote:
> I have thought about using symbols, but the only way to delete symbols that
> I know of involves exiting J. And, my starting premise was that I
The J video here - https://www.youtube.com/watch?v=OzaIi8BnHIc - walks you
through building the J code for Project Euler problem 1. It ends with a
variant that leads into Pascal's extremely terse version.
On Tue, Apr 8, 2014 at 11:56 AM, Pascal Jasmin wrote:
>3 5 (0=|)"0 1 i.10
> 1 0 0 1 0
3 5 (0=|)"0 1 i.10
1 0 0 1 0 0 1 0 0 1
1 0 0 0 0 1 0 0 0 0
3 5 (0 ([: +./ =) |"0 1) i.10
1 0 0 1 0 1 1 0 0 1
3 5 (] #~ 0 ([: +./ =) |"0 1) i.10
0 3 5 6 9
+/ 3 5 (] #~ 0 ([: +./ =) |"0 1) i.1000
233168
- Original Message -
From: Jon Hough
To: "programm...@jsoftware.c
Hey Jon,
It can be written in one go, try:
+/@result f.
This fixes the all verbs, converting a verb to it's constituent primitives.
That said, you are over-specifying your ranks. Ranks are there by default,
and as it happens = already has rank 0, so there is no use in setting the
ranks.
Other
Hi Jon,
Have you had a chance to watch the J in 10 minutes video that Martin Saurer
produced a few days ago (link below). About a minute in, Project Euler #1 is
used as an example to explain a J approach to the problem.
https://www.youtube.com/watch?v=OzaIi8BnHIc&list=PLLcTTp6EQ_egylIerYEjCBbE
Hi,
Thanks for the reply. That is essentially what I tried to do.
"Multiply the number by 1 if it has remainder zero on division by 3 or 5, 1
otherwise. Then sum.".
But my J is clunky, ugly and doesn't look like other peoples' J.
> Date: Tue, 8 Apr 2014 11:39:07 -0400
> From: ircsurfe...@gmail
Hey Jon,
I remember seeing this done by someone before. They went about it like this:
generate numbers 0 through 1000
a = i.1000
create a "mask" list of 0s and 1s where the numbers are divisible by 3 and 5
(pseudo code: b = a % 3 OR a % 5)
multiply the mask list and the number list together
and
a
I have thought about using symbols, but the only way to delete symbols that
I know of involves exiting J. And, my starting premise was that I would
have too much data to fit into memory.
For some computations it does make sense to start up an independent J
session for each part of the calculation
Euler Project #1 is:If we list all the natural numbers below 10 that are
multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.
In C/Java I could easily do something like:
int total =0;
for (int counter = 0; counter <
Looks to me like a mapped file would be good
-
Björn Helgason
gsm:6985532
skype:gosiminn
On 8.4.2014 06:40, "Raul Miller" wrote:
> Consider this example:
>
> table=:<;._2;._2]0 :0
> First Name,Last Name,Sum,
> Adam,Wallace,19,
> Travis,Smith,10,
> Donald,Barnell,8,
> Gary,Wallace,27,
> James,Smi
Its very cool to develop routines to treat delimited files as data. This can
make sense as large read only reference data, or generally low priority
"discardable" data. Your example might be a file that is generated by an
"expensive" other query process and will be replaced next time it is run
Thanks for pointing this out.
The next Qt release will allow isigraph to resize the way you want.
Also, the table control is stable now, and that early comment about syntax
changing will be removed.
On Mon, Apr 7, 2014 at 5:52 PM, Christoph von Basum <
christoph.von.ba...@gmail.com> wrote:
>
It seems this representation is somewhat similar to how the symbol table
stores strings:
http://m.jsoftware.com/help/dictionary/dsco.htm
Also, did you consider using symbols? I've used symbols for string columns
that contain highly repetitive data, for example, an invoice table with an
alpha-nume
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