APL Wiki:Formatting

APL Wiki is a standard MediaWiki, so the MediaWiki documentation for applies. In particular, the following are useful:

• Links
• Formatting

However, please familiarise yourself with the below APL Wiki-specific guidelines before making any major edits.

Links to Wikipedia

Linking to a Wikipedia page is more like an internal link than an external one: both technically, because it uses MediaWiki just like APLWiki, and conceptually, because Wikipedia also has encyclopedic information on a variety of topics. And in fact Wikipedia links are supported by our internal link syntax. This form is preferred because it is displayed with a "W" as an indication to the reader. Write an internal link as it would appear on Wikipedia, but put wikipedia: in front.

A Wikipedia link always needs to be given displayed text with |, because otherwise it will appear with that wikipedia: in the link, a very cluttered display! However, when editing there is a shortcut that can often be used. Writing the | character with no text afterwards will strip wikipedia: and any trailing material in parentheses from the display, so that for example [[wikipedia:APL (programming language)|]] displays as APL.

Mentioning subjects that have their own page

It is fine for a page to have a section about a subject that also has its own page. When that happens, begin the section with {{Main|subject}} where subject is the target page title. Don't include double brackets (as a page link) — it is done for you.

Yes/No tables

For tables comparison tables, use the {{Yes}}, {{No}}, and {{Maybe}} templates, e.g.:

{| class=wikitable
 ! Get wet?
             | Indoors || Outdoors  || Swimming
 |-
 | Sunshine || {{No}}  || {{No}}    || {{Yes}}
 |-
 | Rain     || {{No}}  || {{Maybe}} || {{Yes}}
|}

gives:

Get wet?	Indoors	Outdoors	Swimming
Sunshine	No	No	Yes
Rain	No	Maybe	Yes

Custom options

You can customise the text by supplying an argument:

{| class=wikitable
 ! Get wet?
             | Indoors        || Outdoors             || Swimming
 |-
 | Sunshine || {{No}}         || {{No|Obviously not}} || {{Yes}}
 |-
 | Rain     || {{No|Depends}} || {{Maybe|Umbrella?}}  || {{Yes|Obviously}}
|}

gives:

Get wet?	Indoors	Outdoors	Swimming
Sunshine	No	Obviously not	Yes
Rain	Depends	Umbrella?	Obviously

Inserting code

Mathematical notation

MathJax is enabled, so you can insert mathematical notation (for example for Iverson notation) inline using

included the expression <math>\bot p_{32,33}:+/\alpha^2/I^0</math> in its description

which results in:

included the expression $\bot p_{32,33}:+/\alpha ^{2}/I^{0}$ in its description

For multiple and larger mathematical expressions, use

included the expression
:<math>i \gets O^{\bot I^0_{0,1,2,3}}_{\bot I^0_{4,5,6,7}}</math>
in its description

which results in:

included the expression

$i\gets O_{\bot I_{4,5,6,7}^{0}}^{\bot I_{0,1,2,3}^{0}}$

in its description

Equivalence

It is quite common to state equivalences. Please use a proper equivalence arrow, which is easy to insert with the template:

this {{←→}} that

which results in:

this $\Leftrightarrow$ that

Inline code

Inline code is used for single primitives and short expressions and uses the format

<source lang=apl inline>(2=+⌿0=N∘.|N)/N←⍳100</source>

which results in

(2=+⌿0=N∘.|N)/N←⍳100

Code blocks

For session transcripts, function definitions and longer expressions, use code blocks like

<source lang=apl>
      (2=+⌿0=N∘.|N)/N←⍳100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
</source>

which results in:

      (2=+⌿0=N∘.|N)/N←⍳100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Optionally, you can indicate one or more APL dialects which are able to run the code by using a special template immediately after the source tag, like

<source lang=apl>
      {(2=+⌿0=⍵∘.|⍵)/⍵}⍳100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
</source>
{{Works in|[[Dyalog APL]], [[dzaima/APL]], [[GNU APL]], [[ngn/apl]]}}

which results in:

      {(2=+⌿0=⍵∘.|⍵)/⍵}⍳100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Works in: Dyalog APL, dzaima/APL, GNU APL, ngn/apl

You can also include a permalink to TryAPL, Try It Online, repl.it, or n9n.gitlab.io right before the source tag, for example

[https://tryapl.org/?a=%7B%282%3D+%u233F0%3D%u2375%u2218.%7C%u2375%29/%u2375%7D%u2373100&run Try it now!]
<source lang=apl>
      {(2=+⌿0=⍵∘.|⍵)/⍵}⍳100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
</source>

which results in:

Try it now!

      {(2=+⌿0=⍵∘.|⍵)/⍵}⍳100
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Very long code blocks

Use

{{Collapse|The below code generates a tall column of numbers.|
<source lang=apl>
      ⍪⍳10
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
</source>
}}

which results in:

The below code generates a tall column of numbers.

      ⍪⍳10
 1
 2
 3
 4
 5
 6
 7
 8
 9
10

Creating new pages

Primitives and other built-ins

When creating a page for a primitive function, operator, or quad name, begin the page with the following template:

{{Built-in|Log|⍟}}

This inserts the text

⍟

Log (⍟)

and also inserts a nice big illustration of the glyph on the page:

At the bottom such pages, include {{APL built-ins}} and edit that template's content if the page you're creating isn't already listed there.

Dialects

Begin your page about an APL dialect with the Infobox array language info box. These are all the optional parameters it supports:

{{Infobox array language
| title =
| developer =
| released =
| latest release version =
| withdrawn =
| array model =
| index origin =
| function styles =
| numeric types =
| unicode support =
| file ext =
| implementation language =
| implementation languages =
| source =
| platform =
| platforms =
| operating system =
| operating systems =
| license =
| website =
| forum =
| download =
| documentation =
| run online =
| influenced by =
| influenced =
}}

Have a look at the existing dialect pages, e.g. Dyalog APL, to see how these values are used, Try to fill in as many as you can (but use only one of each singular/plural pair). You only need to use title if the language title differs from the page title (e.g. for technical reason like the inability to create a page that begins with a lowercase letter). In that case, begin the page with {{DISPLAYTITLE:real name}} where real name should be the proper name of the dialect.

At the bottom of the page, include {{APL programming language}} and edit that template's content if the dialect you're creating a page about isn't already listed there.

People, organisations, and what they do

Insert {{APL community}} at the very bottom of the page, and edit that template's content if the page you're creating isn't already listed there.