If anyone think NuVoc buries a key issue, they are encouraged to add to
the information to NuVoc.
I don't mean Raul. Raul knows this better than anyone and has put a lot
of time into all aspects of J. Others should accept that the old
documentation isn't going to change and if NuVoc is defic
On Sat., Feb. 4, 2023, 01:56 bill lam, wrote:
> IMO reading documentation seriously by yourself is essential for learning
> J. Without doing that others can't help you much.
>
I will say again, please point me to the document and the
exact entry that you are referring to.
Tell me what constitut
IMO reading documentation seriously by yourself is essential for learning
J. Without doing that others can't help you much.
Please also learn how to use jwiki to search for information you need, eg
using the search button.
On Sat, 4 Feb 2023 at 3:33 PM Ak O wrote:
> On Fri., Feb. 3, 2023, 04:18
Thank you.
On Sat., Feb. 4, 2023, 00:39 Raul Miller, wrote:
> I guess you might want
> https://code.jsoftware.com/wiki/Vocabulary/Foreigns#m3 which has a
> link to the page sort of buried part way down
> https://code.jsoftware.com/wiki/Vocabulary/bangco
>
> Personally, I still prefer the old doc
On Fri., Feb. 3, 2023, 07:18 Don Guinn, wrote:
> It's nice to not have to read and write the file using mapped files. J or
> the system does it for you. The data can be shared by multiple instances of
> J or whatever. And data is preserved over restarts. But things get messy if
> the array gets b
On Fri., Feb. 3, 2023, 05:55 Raul Miller, wrote:
> Minor nitpick:
>
> 3!:1 (and 3!:3) represent the a noun textually
>
> 3!:2 reconstitutes the original noun.
>
> Anyways, personally, I'd prefer to say that 3!:1 gives a
> representation of the noun. (Or 3!:3, but 3!:1 is more convenient, and
There's also memory limits imposed from outside of J.
For example, there's the `ulimit` unix command, and there can be hard
coded OS limitations (for example on a 32 bit machine, the OS might
limit you to 2GB or 3 GB of memory). And, of course, there's the
amount of memory which you actually have
The only memory settings that I am aware of are the 9!:20 and 9!:21 foreigns
https://www.jsoftware.com/help/dictionary/dx009.htm
Cheers, bob
> On Feb 3, 2023, at 23:47, Ak O wrote:
>
> On Fri., Feb. 3, 2023, 05:17 Jan-Pieter Jacobs,
> wrote:
>
>> 3!:2 just gives a representation of the noun.
On Fri., Feb. 3, 2023, 05:17 Jan-Pieter Jacobs,
wrote:
> 3!:2 just gives a representation of the noun. JMF memory-maps a file via
> the OS, so you can access the file's content as if it were just normal
> memory. It will stay only on disk as long as only in-place methods are used
> to change it (
I guess you might want
https://code.jsoftware.com/wiki/Vocabulary/Foreigns#m3 which has a
link to the page sort of buried part way down
https://code.jsoftware.com/wiki/Vocabulary/bangco
Personally, I still prefer the old documentation, like
https://www.jsoftware.com/help/dictionary/dx003.htm becau
On Fri., Feb. 3, 2023, 04:18 bill lam, wrote:
> Please see nuvoc foreign conjunction for detail if you don't know anything
> about 3!:1/3!:2.
>
Which link takes me to the explanatory documentation that you are
referencing?
> https://www.jsoftware.com/help/dictionary/d412.htm
https://code.jsoftwa
If all you want to do is store J arrays to file, I've been doing this for
many years using my own WS code:
https://code.jsoftware.com/wiki/Scripts/WS_Files.
On Fri, Feb 3, 2023 at 9:18 AM Don Guinn wrote:
> It's nice to not have to read and write the file using mapped files. J or
> the system do
It's nice to not have to read and write the file using mapped files. J or
the system does it for you. The data can be shared by multiple instances of
J or whatever. And data is preserved over restarts. But things get messy if
the array gets bigger than the size of the mapped file. But jmf does not
Minor nitpick:
3!:1 (and 3!:3) represent the a noun textually
3!:2 reconstitutes the original noun.
Anyways, personally, I'd prefer to say that 3!:1 gives a
representation of the noun. (Or 3!:3, but 3!:1 is more convenient, and
efficient, when writing to a file.)
This is a really minor issu
3!:2 just gives a representation of the noun. JMF memory-maps a file via
the OS, so you can access the file's content as if it were just normal
memory. It will stay only on disk as long as only in-place methods are used
to change it (doing something like othervar=: +: mapped var will copy it
entire
Please see nuvoc foreign conjunction for detail if you don't know anything
about 3!:1/3!:2.
No, Jmf and 3!:1/3!:2 are totally different.
On Fri, 3 Feb 2023 at 6:04 PM Ak O wrote:
> I guess one of my questions directed at how the function works under the
> hood.
>
> Is it that 3!:2 is the mechan
I guess one of my questions directed at how the function works under the
hood.
Is it that 3!:2 is the mechanism jmf uses to treat the map?
How do these forms differ?
Ak
On Thu., Feb. 2, 2023, 22:31 Raul Miller, wrote:
> You can measure overhead with timespacex
>
> Maybe you had already been do
You can measure overhead with timespacex
Maybe you had already been doing that?
--
Raul
On Thu, Feb 2, 2023 at 11:29 PM Ak O wrote:
>
> Is this less overhead than the jmf form?
>
> In your example, every case where I want to operate on a file or an object
> within the file requires translation
Is this less overhead than the jmf form?
In your example, every case where I want to operate on a file or an object
within the file requires translation through the 3!:2 operator.
Maybe it is functionally the same as the map_jmf_ function, or am I
thinking about this incorrectly?
Or can you pleas
'testfile.txt' fwrite~3!:1 'Hello World!';(i.3 4);<2 1$'Text Here';1 2 3 4
456
3!:2 fread 'testfile.txt'
┌┬─┬───┐
│Hello World!│0 1 2 3│┌─┐│
│ │4 5 6 7││Text Here││
│ │8 9 10 11│├─┤│
│ │ ││1 2 3 4 ││
│ │ │└─┘│
└┴─┴
In this case the data is an array of boxes.
The datatype is 'boxe'd.
The data is of some shape.
These things have to be preserved in order to correctly restore them
later. (at some cost, up-front to specify them, afterwards to recall the
specifics, or something else) It might be easy to write as
Using Jmf is overkill. Also what are the advantages of jmf over 3!:1/3!:2
in this case?
On Thu, 2 Feb 2023 at 7:17 PM Ak O wrote:
> load 'jmf'
> NB. Loads jmf facilities.
>
> testfile =: {2,\?50#75
>
> fn =: jpath 'C:\Users\skip\J904-user\temp\foo\testfile_name.jmf'
> NB. Links a
load 'jmf'
NB. Loads jmf facilities.
testfile =: {2,\?50#75
fn =: jpath 'C:\Users\skip\J904-user\temp\foo\testfile_name.jmf'
NB. Links a covername to the file path.
createjmf_jmf_ fn;(([:(*&8)#);testfile)
NB. Create the container for your file.
NB. -fn is your reference name
N
I think this could be of interest as well:
https://code.jsoftware.com/wiki/Guides/Component_Files
Component files allow to store multiple, different nouns to be saved as
well. It's an addon named data/jfiles, you can load, once installed, using:
load'jfiles'
Best regards,
Jan-Pieter
On Thu, 2
fn =. < 'C:\Users\skip\J904-user\temp'
this is a folder name
you should give a file name, use something like
fn =. < 'C:\Users\skip\J904-user\temp\foo'
or just
fn =. <'~temp/foo' NB. this work for fwrite but not 1!:2
On Thu, Feb 2, 2023 at 1:16 PM 'Skip Cave' via Programming <
programm...@jsoft
I tried Bill's suggestion:
fn =. < 'C:\Users\skip\J904-user\temp'
fn (fwrite~ 3!:1) {2,\?15#50
_1
(3!:2)@fread fn
|domain error
| (3!:2)@fread fn
Looks like some kind of write error. Where in the doc are these errors
defined?
Skip Cave
Cave Consulting LLC
On Wed, Feb 1, 2023 at 11:07 PM
1!:1 and 1!:2 can only operate on simple strings (rank 1 literal array)
You can use 3!:1 and 3!:2 to convert between J array and simple string,eg
fn (fwrite~ 3!:1) {2,\?15#50
(3!:2)@fread fn
this way you need not assign the value of {2,\?15#50 to a name
On Thu, Feb 2, 2023 at 12:48 PM 'Skip Ca
Methinks you want 5!:5, to generate a linear representation to write out, and
then "., to parse that representation back into a noun after you've read it
back. Actually doing the reading and writing can be done however you prefer;
I would just use fread/fwrite.
On Wed, 1 Feb 2023, 'Skip Cave'
I think you want to start with
5!:5 <'testfile'
which is text.
--
For information about J forums see http://www.jsoftware.com/forums.htm
I have a boxed noun:
] testfile =: {2,\?15#50
┌┬─┬─┬─┬─┬─┬┬┬┬┬─┬┬───┬┐
│9 21│21 47│47 37│37 13│13 33│33 20│20 4│4 49│49 6│6 25│25 33│33 9│9 6│6 43│
└┴─┴─┴─┴─┴─┴┴┴┴┴─┴┴───┴┘
I want to store
30 matches
Mail list logo
