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# About
This is the wiki for the J programming language.
Before you can edit the wiki, you must create an account. To do so, please email the wiki group with subject Subscribe and contents your login name (First Last) and email address.
After creating an account, log in to be able to edit the wiki.
You are free to ... | About | About | jwiki_cpt | core | wikitext | 1,028 | About |
# Addons/Categories
## Addon Categories
Addon categories are the top-level folder names under `~addons`. Several names are pre-defined, as below:
| name | description |
| --- | --- |
| api | Application programming interfaces |
| arc | Archivers, files, zips etc. |
| convert | Conversions |
| data | Database |
| deb... | Addons/Categories | Addons/Categories | jwiki_cpt | core | wikitext | 1,638 | Addons/Categories |
# Addons/Config/Categories
The following is a list of addon categories and brief descriptions.
| name | description |
| --- | --- |
| api | Application programming interfaces |
| arc | Archivers, files, zips etc. |
| convert | Conversions |
| data | Database |
| debug | Debugging aids |
| demos | Demos |
| docs | Gen... | Addons/Config/Categories | Addons/Config/Categories | jwiki_cpt | core | wikitext | 1,570 | Addons/Config/Categories |
# Addons/Developers_Checklist
This page lists the various steps required to create an addon.
Read the Addons/Developers Guide for an overview of the development system.
You need the SVN client installed, see Subversion, and in particular, the Subversion/User Guide.
You need update access to the Jsoftware reposit... | Addons/Developers_Checklist | Addons/Developers_Checklist | jwiki_cpt | core | wikitext | 2,120 | Addons/Developers_Checklist |
# Addons/Developers_Guide
## Overview
Addons packages are created in github repositories, and installed in the `~addons` subfolder of a J installation.
The folders are in two levels, with the top level folder being the addon category, see Addons/Config/Categories. Any name can be used for the bottom level folders. T... | Addons/Developers_Guide | Addons/Developers_Guide | jwiki_cpt | core | wikitext | 5,899 | Addons/Developers_Guide |
# Addons/GitHub
*This is a proposal for github-based addons to be introduced in J807. Comments may be added here or addressed to the general forum.*
### Overview
Up to now, the sole source for all addons is an SVN repo hosted by Jsoftware. This was appropriate when SVN was the most popular version control system and... | Addons/GitHub | Addons/GitHub | jwiki_cpt | core | wikitext | 3,323 | Addons/GitHub |
# Addons/Installation
## Overview
For core addons (those downloadable directly from Jsoftware) and the base library, there is a Jqt GUI interface called Package Manager and a console interface using the `jpkg` verb.
Other addons can be installed from github using the `install` verb.
In each case you need internet a... | Addons/Installation | Addons/Installation | jwiki_cpt | core | wikitext | 570 | Addons/Installation |
# Addons/Test_scripts
# Test Scripts for Addons
Including test script(s) with your addon:
helps prevent the introduction of bugs during development
makes it easier for new developers to contribute changes without fear of screwing up
provide valuable example data and usage to users
The WhyTestCases page on the AP... | Addons/Test_scripts | Addons/Test_scripts | jwiki_cpt | core | wikitext | 4,306 | Addons/Test_scripts |
# Addons/Versioning
## Overview
This document describes the Subversion (SVN) layout, build and install procedures in terms of addons versioning and relationship with the J system and library releases. This is largely a historical document, as addons are currently stored on github.
The current version of any addon is... | Addons/Versioning | Addons/Versioning | jwiki_cpt | core | wikitext | 2,795 | Addons/Versioning |
# Addons/api/expat
The api/expat addon provides a J interface to the expat xml parser.
Typical use might start with:
```j
require'api/expat'
coinsert'jexpat'
```
as the addon defines names in the jexpat locale and expects to work with callbacks in a locale which inherits from the `jexpat` locale.
Generally speakin... | Addons/api/expat | Addons/api/expat | jwiki_cpt | core | wikitext | 2,499 | Addons/api/expat |
# Addons/api/java
<pre>
api:
public class JInterface
public static String libjDir=""; // folder of J engine binary, may be empty
public static String libj=""; // name of J engine binary
public int callJ(String sentence) // run and return error code
public String dors(String sen... | Addons/api/java | Addons/api/java | jwiki_cpt | core | wikitext | 4,845 | Addons/api/java |
# Addons/api/jc
<pre>
+overview
J bindings for C library routines and stdin/stdout tasks
J uses C name except that fopen is sopen etc.
+stream
s=. sopen_jc_ 'foo.txt';'w'
s=. sdopen_jc_ fd;'w'
sclose_jc_ s
swrite_jc_ s;'data'
d=. sread_jc_ s,n or _1 for all
b=. stell_jc_ s
sseek_jc_ s,n
... | Addons/api/jc | Addons/api/jc | jwiki_cpt | core | wikitext | 2,187 | Addons/api/jc |
# Addons/api/python3
## Overview
This addon has functions for calling J from Python.
## Setup
Assuming J is already installed, use below commands to create a Python virtual environment for your project and install package.
### Windows
```j
python3 -m venv MyProject
cd MyProject
Set-ExecutionPolicy -Scope Process ... | Addons/api/python3 | Addons/api/python3 | jwiki_cpt | core | wikitext | 2,650 | Addons/api/python3 |
# Addons/arc/jar
JAR, or J-ARchive, is a complete database system for J words, data, test cases and general scripts. JAR is also a detailed example of J object oriented programming.
JAR can be used by itself or with the J project manager. Extensive documentation in Adobe PDF format is installed with JAR. J labs demon... | Addons/arc/jar | Addons/arc/jar | jwiki_cpt | core | wikitext | 883 | Addons/arc/jar |
# Addons/arc/lz4
<pre>
This lz4 addon requires lz4 binary library to encode and decode
lz4 raw and frame blocks.
For Linux, if lz4 had not been installed, then install it by
1. Debian derivatives
$ sudo apt-get install lz4
1. Redhat derivatives
$ sudo dnf install lz4
For Windows and Mac, lz4 binary is bundled with... | Addons/arc/lz4 | Addons/arc/lz4 | jwiki_cpt | core | wikitext | 429 | Addons/arc/lz4 |
# Addons/arc/zip
**arc/zip** - zip file utilities
Provides zip file utilities with API similar to the `files` package.
Based on zlib 1.2.3 and
minizip libraries.
Interface API is similar to the files package.
Includes Win32, Linux and Mac OS X universal binaries.
Browse source and examples in SVN.
## Installation... | Addons/arc/zip | Addons/arc/zip | jwiki_cpt | core | wikitext | 7,467 | Addons/arc/zip |
# Addons/arc/ziptrees
**general/ziptrees**
Provides verbs for zipping and unzipping directory trees.
The dirutils addon must also be installed.
Browse source and examples in SVN.
## Verbs
| unziptree | v | Unzip zipfile y to directory tree x. |
| --- | --- | --- |
| zipfiles | v | Add/Append one or more files to... | Addons/arc/ziptrees | Addons/arc/ziptrees | jwiki_cpt | core | wikitext | 1,156 | Addons/arc/ziptrees |
# Addons/arc/zlib
<pre>
This zlib addon requires zlib binary library to encode and decode
zlib/deflate streams. When zlib binary library is un-available,
it will use pure J scripts which is much less efficient.
For Linux, zlib should already be installed by default in most distros.
If not, install using (debian and ... | Addons/arc/zlib | Addons/arc/zlib | jwiki_cpt | core | wikitext | 536 | Addons/arc/zlib |
# Addons/convert/json
convert/json supports conversion from json to a representation in J, using `dec_json`. These values can also be converted back to json using `enc_json`. For example:
```j
dec_json'[1,2,3]'
┌─┬─┬─┐
│1│2│3│
└─┴─┴─┘
enc_json dec_json'[1,2,3]'
[1,2,3]
```
See also: convert/pjson
| Addons/convert/json | Addons/convert/json | jwiki_cpt | core | wikitext | 308 | Addons/convert/json |
# Addons/convert/misc/vig
## Vigenère Cipher
As an addon, load with
`load'convert/misc/vig'`
The Vigenère cipher is a method of encryption that uses a series of different
Caesar ciphers based on the letters of a keyword.
[ Download script: vig.ijs ]
```j
NB.*vig c Vigenère cipher
NB. cipher=. key 0 vig charset pla... | Addons/convert/misc/vig | Addons/convert/misc/vig | jwiki_cpt | core | wikitext | 2,211 | Addons/convert/misc/vig |
# Addons/convert/misc
### toascii85
Converts to/from ascii85 representation. Defines:
toascii85 `-` to ascii85 representation
fromascii85 `-` from ascii85 representation
### base64
Converts to/from base64 representation. Defines:
tobase64 `-` to base64 representation
frombase64 `-` from base64 representation
#... | Addons/convert/misc | Addons/convert/misc | jwiki_cpt | core | wikitext | 475 | Addons/convert/misc_DirX |
# Addons/convert/numpy
## Overview
This addon has functions for reading and writing numpy npy and npz files.
The npy files should contain a single unnested array. The result of reading an npy file is a J noun.
The npz files are zips of one or more npy files. Data for reading and writing npz files should be a 2 colu... | Addons/convert/numpy | Addons/convert/numpy | jwiki_cpt | core | wikitext | 1,628 | Addons/convert/numpy |
# Addons/convert/pjson
## Overview
This is a json encoder/decoder and is read into the `pjson` locale. Load with:
```j
load 'convert/pjson'
```
The main functions are `enc` and `dec`:
```j
enc_pjson_ 1 2 3;'hello'
[[1,2,3],"hello"]
dec_pjson_ enc_pjson_ 1 2 3;'hello'
┌─────┬─────┐
│1 2 3│hello│
└─────┴──... | Addons/convert/pjson | Addons/convert/pjson | jwiki_cpt | core | wikitext | 1,463 | Addons/convert/pjson |
# Addons/data/dbman
**data/dbman** - simple ODBC database and query browser
Provides an example of integrating the `dd` API
with a simple GUI application.
Browse SVN sources.
## Installation
Use JAL/Package Manager or download the `data/dbman` archive from JAL:j601/addons and extract it into the `~addons/data/dbma... | Addons/data/dbman | Addons/data/dbman | jwiki_cpt | core | wikitext | 816 | Addons/data/dbman |
# Addons/data/sqlite/Basic_Usage
## Overview
The addon is read into locale `psqlite`. A sqlite database is opened or created in an instance of this locale, and subsequent access uses this instance.
For example, using the `sandp` database included with the addon:
```j
load 'data/sqlite'
db=: sqlopen_psqlite_ '... | Addons/data/sqlite/Basic_Usage | Addons/data/sqlite/Basic_Usage | jwiki_cpt | core | wikitext | 4,651 | Addons/data/sqlite/Basic_Usage |
# Addons/data/sqlite/Create
A sqlite database is an ordinary file. The `sqlcreate` function creates and opens a file, and returns a database locale.
## sqlcreate
This creates a database, given a file name. Any existing file is overwritten.
For example:
```j
load 'data/sqlite'
F=: '~temp/t1.db'
db=: sqlcr... | Addons/data/sqlite/Create | Addons/data/sqlite/Create | jwiki_cpt | core | wikitext | 695 | Addons/data/sqlite/Create |
# Addons/data/sqlite/Definitions
Functions to open/close databases are called in the `psqlite` locale. Once a database is open, functions to access it are called in the database locale. Some examples assume the `sandp` database is open in locale `db`.
## Call SQL commands
### sqlcmd
Call SQL commands, with no resul... | Addons/data/sqlite/Definitions | Addons/data/sqlite/Definitions | jwiki_cpt | core | wikitext | 8,449 | Addons/data/sqlite/Definitions |
# Addons/data/sqlite/Examples
There are two sample databases included with the addon in subdirectory `db`. Other sqlite example databases are readily available on the web.
sandp is the standard Suppliers and Parts database
chinook is an open source database that is an alternative to Northwind. A selection of table... | Addons/data/sqlite/Examples | Addons/data/sqlite/Examples | jwiki_cpt | core | wikitext | 3,299 | Addons/data/sqlite/Examples |
# Addons/data/sqlite/Installation
The addon is installed in the usual way. However, the sqlite binaries are not automatically included, because of their size.
When the addon is loaded, it checks that the sqlite binary has been installed, and if so, also checks that it is up to date. If necessary, a prompt is given to... | Addons/data/sqlite/Installation | Addons/data/sqlite/Installation | jwiki_cpt | core | wikitext | 585 | Addons/data/sqlite/Installation |
# Addons/data/sqlite/Nulls
User-defined nulls were added in v1.0.23.
### Null values
To allow for nulls in data, the addon defines three "null value" globals in the psqlite locale. These are set whenever a database is opened. The default values are as follows, where the integer null is the largest possible negative ... | Addons/data/sqlite/Nulls | Addons/data/sqlite/Nulls | jwiki_cpt | core | wikitext | 2,441 | Addons/data/sqlite/Nulls |
# Addons/data/sqlite/Overview
## Overview
The sqlite interface allows direct access to sqlite databases.
The interface consists of a J script and a copy of sqlite that has been extended with functions to enable fast read/write from J. Apart from the extra functions, this is the standard sqlite and includes the full ... | Addons/data/sqlite/Overview | Addons/data/sqlite/Overview | jwiki_cpt | core | wikitext | 1,103 | Addons/data/sqlite/Overview |
# Addons/data/sqlite/Quirks
## Sqlite varying column types
The sqlite database allows for columns that have more than one datatype (which is unusual for SQL databases). For example, a column of integers may have one or more values that are character strings. The data/sqlite addon assumes that all values in a column a... | Addons/data/sqlite/Quirks | Addons/data/sqlite/Quirks | jwiki_cpt | core | wikitext | 1,340 | Addons/data/sqlite/Quirks |
# Addons/data/sqlite/zFns
Usually only one sqlite database is accessed at a time. In this case, it is convenient to use cover functions in the z locale that reference a global `locDB` with the sqlite instance.
To read in sqlite and the cover functions:
```j
load 'data/sqlite/sqlitez'
```
The cover functions are ... | Addons/data/sqlite/zFns | Addons/data/sqlite/zFns | jwiki_cpt | core | wikitext | 762 | Addons/data/sqlite/zFns |
# Addons/debug/jig
### An Updated Version of Jig
**Jig is an application that extends the standard textual output of J using SVG (Scalable Vector Graphics) to provide far more information for users.**
As an example, in a Jig display, nouns with a shape of 1 2 can be easily distinguished from nouns with shape 2 as n... | Addons/debug/jig | Addons/debug/jig | jwiki_cpt | core | wikitext | 2,460 | Addons/debug/jig |
# Addons/debug/lint
**debug/lint** - Static sentence checker and flow analyzer for J verbs
Browse history, source and examples using github.
## Operation
Use `lint` in place of `load` to check your explicit definitions.
lint tries to find errors before a script is run. The idea is for 'lint' to replace 'load'
dur... | Addons/debug/lint | Addons/debug/lint | jwiki_cpt | core | wikitext | 3,605 | Addons/debug/lint |
# Addons/debug/tte
**debug/tte** - Tacit-to-explicit verb definition converter
Explicates a tacit verb `u` (the "explicand").
The result is the "explication" of `u` --
i.e. an explicit definition behaving like the original verb: `u` .
Each sentence computes an intermediate result from a phrase
of (tacit) `u` -- usua... | Addons/debug/tte | Addons/debug/tte | jwiki_cpt | core | wikitext | 4,051 | Addons/debug/tte |
# Addons/docs/joxygen
## Joxygen
Html pages are built by Pandoc from comments in J scripts. Pandoc should be installed before running Joxygen.
Documentation is read from comments that start with an arithmetic character,
i.e. from the set `+-*%` . These indicate:
`NB.%` script documentation
`NB.*` definition docume... | Addons/docs/joxygen | Addons/docs/joxygen | jwiki_cpt | core | wikitext | 4,132 | Addons/docs/joxygen |
# Addons/docs/wikihtml
**docs/wikihtml** - HTML snapshot of wiki sections
This addon provides an HTML snapshot of wiki sections that document core **J** functionality. The snapshot provides for offline/local browsing of available sections. Hopefully it will soon be rendered obsolete once the PDF generation of wiki se... | Addons/docs/wikihtml | Addons/docs/wikihtml | jwiki_cpt | core | wikitext | 700 | Addons/docs/wikihtml |
# Addons/finance/finexec
# Introduction
Finexec is an addon for financial and actuarial computing with the J Programming Language.
Objective to promote J for solving problems.
# Installation
Finexec is currently loaded from the GitHub repository.
https://github.com/WilliamSzuch
In a J session use:
```j
install... | Addons/finance/finexec | Addons/finance/finexec | jwiki_cpt | core | wikitext | 897 | Addons/finance/finexec |
# Addons/format/sbox
# Addon: format/sbox - Displaying boxed nouns containing Unicode glyphs
## Introduction
Has anyone else felt the need to display a boxed noun which contains Unicode glyphs?
Such as:
```j
< u: 9017 32 9054
```
or:
```j
a=: 'dom⌹'
b=: 'qqd⍞ & domino⌹'
c=: (2 3) ; a ; b
d=: '⍞and⌹... | Addons/format/sbox | Addons/format/sbox | jwiki_cpt | core | wikitext | 4,307 | Addons/format/sbox |
# Addons/format/zulu
## ZULU: Stringlist conversion package
This package is specially addressed to newcomers to J who wish to write their own distributable app, eg for teaching purposes.
Addon: ZULU loads a library of verbs to convert **stringlists** (lists, or arrays, of strings)
between different formats.
The fou... | Addons/format/zulu | Addons/format/zulu | jwiki_cpt | core | wikitext | 7,972 | Addons/format/zulu |
# Addons/games/minesweeper
**games/minesweeper** - Basic implementation of classic Minesweeper game using different user interfaces.
The main purpose of this addon is to compare and contrast different the GUI building technologies available for J.
The following UI implementations are available:
| **Script** | **UI ... | Addons/games/minesweeper | Addons/games/minesweeper | jwiki_cpt | core | wikitext | 2,491 | Addons/games/minesweeper |
# Addons/games/nurikabe
This is a GUI for the game Nurikabe.
Load the script, then run verb nurikabe as below:
```j
load 'games/nurikabe'
nurikabe '' NB. default game
nurikabe board NB. game with given board
nurikabe name;board NB. game with given name and board
nurikabe filename NB. game read... | Addons/games/nurikabe | Addons/games/nurikabe | jwiki_cpt | core | wikitext | 363 | Addons/games/nurikabe |
# Addons/general/dirtrees
**general/dirtrees** - Directory tree utilities
Provides verbs for copying and deleting directory trees.
The dirutils addon must also be installed.
Browse source and examples in github.
## Verbs
| copytree | v | Copies directory tree from directory y to directory x |
| --- | --- | --- |... | Addons/general/dirtrees | Addons/general/dirtrees | jwiki_cpt | core | wikitext | 1,150 | Addons/general/dirtrees |
# Addons/general/dirutils
**general/dirutils** - Directory utilities
Provides verbs for working with directories.
Required by the dirtrees and ziptrees Addons.
Browse source and examples in github.
## Verbs
| addPS | v | Ensures trailing path separator |
| --- | --- | --- |
| dropPS | v | Drops trailing path sep... | Addons/general/dirutils | Addons/general/dirutils | jwiki_cpt | core | wikitext | 910 | Addons/general/dirutils |
# Addons/general/inifiles
**general/inifiles** - INI file utilities
Provides verbs to read from and write to INI files or strings in INI file format.
Uses regex functionality built into J and is therefore usable on all platforms (not reliant on the Windows API).
Provides similar functionality to that provided by W... | Addons/general/inifiles | Addons/general/inifiles | jwiki_cpt | core | wikitext | 1,224 | Addons/general/inifiles |
# Addons/general/jod
**general/jod**
The JOD Page
JOD PDF Documentation
JOD PDF Documentation (alternate server)
JOD GitHub source repository
JOD Documentation in book form from amazon.com
A collection of JOD Jupyter notebooks
Zip archive of JOD releases
current JOD addon release notes
## Installation
Use Pa... | Addons/general/jod | Addons/general/jod | jwiki_cpt | core | wikitext | 580 | Addons/general/jod |
# Addons/general/joddocument
**general/joddocument**
This addon installs local, or offline, JOD documentation. This addon places jod.pdf in the directories expected by JOD.
There is no executable code in this addon it's an optional, but highly recommended, documentation component of JOD.
## Installation
Use Pacma... | Addons/general/joddocument | Addons/general/joddocument | jwiki_cpt | core | wikitext | 533 | Addons/general/joddocument |
# Addons/general/jodsource
**general/jodsource**
The JODSOURCE addon distributes JOD system dictionary databases as serialized dump scripts.
JODSOURCE contains all source materials related to the JOD system. JODSOURCE contains:
1. All J JOD source code
2. J test scripts for JOD
3. DOT digraph code used for some i... | Addons/general/jodsource | Addons/general/jodsource | jwiki_cpt | core | wikitext | 1,080 | Addons/general/jodsource |
# Addons/general/misc
# general/misc
Before using these scripts you will need to ensure they have been installed. This can be done on a connected machine through J's package manager, or from the command line:
```j
load 'pacman'
'install' jpkg 'general/misc'
```
If you are working offline and need to install t... | Addons/general/misc | Addons/general/misc | jwiki_cpt | core | wikitext | 10,608 | Addons/general/misc |
# Addons/general/pcall/test_comcall
```j
require 'general/pcall/ole32'
coinsert 'pole32'
'IJ_'idef IJ=: IDispatch,;:;<;._2(0 : 0)
Do Show Log IsBusy Break Quit Get Set GetM SetM ErrorText
ErrorTextM Clear Transpose ErrorTextB GetB SetB DoR
)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 2... | Addons/general/pcall/test_comcall | Addons/general/pcall/test_comcall | jwiki_cpt | core | wikitext | 1,965 | Addons/general/pcall/test_comcall |
# Addons/general/pcall/test_disp
```j
require 'general/pcall/disp'
p=. disp 'MSXML2.DOMDocument'
'async' put__p 0
++
||
++
'loadXml' do__p '<a b="q123">test</a>'
1
'xml' get__p ''
<a b="q123">test</a>
q1=. disp 'documentElement' get__p ''
'getAttribute' do__q1 'b'
q123
q2=. d... | Addons/general/pcall/test_disp | Addons/general/pcall/test_disp | jwiki_cpt | core | wikitext | 1,164 | Addons/general/pcall/test_disp |
# Addons/general/pcall/test_icall
```j
require 'general/pcall/ole32'
coinsert 'pole32'
'IJ_'idef IJ=: IDispatch,;:;<;._2(0 : 0)
Do Show Log IsBusy Break Quit Get Set GetM SetM ErrorText
ErrorTextM Clear Transpose ErrorTextB GetB SetB DoR
)
ijDoR=: [:'ci3 > i i i *w *i *i' pcall IJ_DoR ; ;
CLSID_JDLLServ... | Addons/general/pcall/test_icall | Addons/general/pcall/test_icall | jwiki_cpt | core | wikitext | 1,398 | Addons/general/pcall/test_icall |
# Addons/general/pcall/test_pcall
```j
require 'dll convert general/pcall'
VAR1=: 'VtR1R2R3Valu'
b=: #~ [: $&1 0 #
h=: ([: ;:^:_1"1 [: <"1 hfd)@(([: , _4 (_2&(3!:4))@|.\ ])^:(2=3!:0))
mi=: [: {.@memr ,&(0 1,JINT)
mc=: ,&0@] memr@, ,&JCHAR@[
'CLSCTX_INPROC_SERVER CLSCTX_LOCAL_SERVER'=: 16b0001 16... | Addons/general/pcall/test_pcall | Addons/general/pcall/test_pcall | jwiki_cpt | core | wikitext | 1,789 | Addons/general/pcall/test_pcall |
# Addons/general/pcall/test_typeinfo
```j
require 'dll convert general/pcall'
b=: #~ [: $&1 0 #
h=: ([: ;:^:_1"1 [: <"1 hfd)@(([: , _4 (_2&(3!:4))@|.\ ])^:(2=3!:0))
us=: 0&(3!:4)
mi=: [: {.@memr ,&(0 1,JINT)
mc=: ,&0@] memr@, ,&JCHAR@[
mI=: 4 : '{.memr y,x,1,JINT'
mS=: 4 : '{.us memr y,x,2,JCH... | Addons/general/pcall/test_typeinfo | Addons/general/pcall/test_typeinfo | jwiki_cpt | core | wikitext | 3,115 | Addons/general/pcall/test_typeinfo |
# Addons/general/pcall
Pointer call is a DLL function call, where function is referred to by its memory location.
See also: examples in SVN folder;
change history.
Applications of pointer call are when the function is not part of dll map. For example
callback, we are given a function address and need to call it, a... | Addons/general/pcall | Addons/general/pcall | jwiki_cpt | core | wikitext | 3,905 | Addons/general/pcall_DirX |
# Addons/general/sfl
The SFL (Standard Function Library) from iMatix is a portable function library for C/C++ programs. The SFL is the result of many years of development, and is provided as Open Source software for the benefit of the Internet community. See iMatrix for a detailed description. The SFL provides about 4... | Addons/general/sfl | Addons/general/sfl | jwiki_cpt | core | wikitext | 776 | Addons/general/sfl |
# Addons/general/unittest
**general/unittest** - Unit Test Framework
Typical framework for test-driven development.
Test units are defined in individual script file.
Main verb `unittest` *file* is defined in the `z` locale.
See also: examples in demo folder in SVN;
change history.
## Installation
Use JAL/Package... | Addons/general/unittest | Addons/general/unittest | jwiki_cpt | core | wikitext | 2,565 | Addons/general/unittest |
# Addons/graphics/bmp
<p>
These are .bmp files in DIB format.
<p>
readbmp and writebmp use RGB values (single numbers).
<p>
writebmp also accepts RGB triples
<p>
main functions:
```j
readbmp read bitmap file, returning RGB data
writebmp write bitmap file from RGB data
readbmphdr read header from bitm... | Addons/graphics/bmp | Addons/graphics/bmp | jwiki_cpt | core | wikitext | 956 | Addons/graphics/bmp |
# Addons/graphics/color
# graphics/color
If you have fully installed J, you should have access to these scripts.
If you are working offline and need to install these scripts you will need to obtain a copy of an archive containing them and unpack it in J's `addons` directory.
Usually, `require` is sufficient to use ... | Addons/graphics/color | Addons/graphics/color | jwiki_cpt | core | wikitext | 10,837 | Addons/graphics/color |
# Addons/graphics/fvj3
The FVJ3 package provides materials for Fractals, Visualization and J, 3rd edition including scripts for simple windows for plotting polygons, working with raster arrays, or experimenting with simple openGL scenes. Also scripts for creating POV-Ray scenes, viewing automata, creating chaotic attr... | Addons/graphics/fvj3 | Addons/graphics/fvj3 | jwiki_cpt | core | wikitext | 579 | Addons/graphics/fvj3 |
# Addons/graphics/gnuplot
**graphics/gnuplot** - create gnuplot graphics
Creates gnuplot graphics from J data. Tested with gnuplot V4.
## Installation
Use JAL/Package Manager or download the `gnuplot` archive from JAL:j601/addons and extract it into the `~addons/graphics/gnuplot` folder.
## Usage
Load with:
```j... | Addons/graphics/gnuplot | Addons/graphics/gnuplot | jwiki_cpt | core | wikitext | 2,722 | Addons/graphics/gnuplot |
# Addons/graphics/graph
<table>
graph: graph package
<p>
gdopen* opens a graphics window
gd... set state
gd... draw graphics
gdshow* show graphics
glclose win|'' close window|active window
glcloseall '' close all graphics windows
glselect win select graphics window
<p>
poi... | Addons/graphics/graph | Addons/graphics/graph | jwiki_cpt | core | wikitext | 4,262 | Addons/graphics/graph |
# Addons/graphics/graphviz
**graphics/graphviz** addon for JQt is a GUI integrating open source graph visualization software graphviz, initiated by AT&T Labs Research, with J. Graphs are described using a simple text-based format called DOT.
J GUI allows to choose from multiple layout engines (e.g. dot for hierarchica... | Addons/graphics/graphviz | Addons/graphics/graphviz | jwiki_cpt | core | wikitext | 1,830 | Addons/graphics/graphviz |
# Addons/graphics/pdfdraw
The *pdfdraw* addon has utilities for drawing to a PDF file or a Publish JPF file.
Much of the code is taken from Plot, and the idea is to support custom report graphics that could not be drawn using Plot.
Unlike Plot, the graphics drawing is at a low level, so some effort is required to de... | Addons/graphics/pdfdraw | Addons/graphics/pdfdraw | jwiki_cpt | core | wikitext | 1,644 | Addons/graphics/pdfdraw |
# Addons/graphics/viewmat
An introduction of the viewmat library is available here: Studio/Viewmat.
A short summary:
viewmat - view arbitrary table
viewrgb - view table of RGB integers
viewpng - view bitmap file
Example to create a 20×20 square with a random black & white pattern, and a random four colour patter... | Addons/graphics/viewmat | Addons/graphics/viewmat | jwiki_cpt | core | wikitext | 483 | Addons/graphics/viewmat |
# Addons/graphics/viewmax
`viewmax` enables visualization of matrices representing slices (cross-sections) of an array of arbitrary rank passed as its argument. The addon extends the functionality of the viewmat addon.
### Quick start
In J9.8, `viewmax` can be loaded directly:
```j
load 'viewmax'
viewmax i. 3 4 5
`... | Addons/graphics/viewmax | Addons/graphics/viewmax | jwiki_cpt | core | wikitext | 2,961 | Addons/graphics/viewmax |
End of preview. Expand in Data Studio
J Continuous Pretraining (wiki and code)
Continuous-pretraining JSONL for the J programming language, without the forum mail archive. Train on the text field.
The full mix, including the Jsoftware forums, is otisberg/j_cpt.
| source | documents | characters | origin |
|---|---|---|---|
jwiki_cpt |
3,108 | 20,069,110 | otisberg/jwiki_cpt, text unchanged |
JcodeV3Stack |
8,462 | 41,483,507 | otisberg/JcodeV3Stack, content stored as text |
| total | 11,570 | 61,552,617 | about 15M tokens at 4 characters per token |
Exact duplicate text is stored once. Two code files were copies of another code file and were dropped.
Use
from datasets import load_dataset
ds = load_dataset("otisberg/j_cpt_noarchive", split="train")
# train on ds["text"]
Fields
| field | description |
|---|---|
text |
Document to train on |
source |
jwiki_cpt or JcodeV3Stack |
id |
Wiki title, or repo/path#hash |
title |
Wiki title or code path |
tier |
Wiki tier, or code license |
kind |
Wiki kind (wikitext, html, ijs) or code language |
n_chars |
len(text) |
source_path |
Wiki path or repo/path |
License
Mixed. The wiki slice is GPL-2.0. Code files are mostly unlabeled, with some permissive licenses (tier).
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