From 2afb23928e1984d475cc460e1672e8f6fa0e4dbe Mon Sep 17 00:00:00 2001 From: Marshall Lochbaum Date: Wed, 11 Aug 2021 17:21:31 -0400 Subject: Allow clicking on header to get fragment link --- docs/doc/fromDyalog.html | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'docs/doc/fromDyalog.html') diff --git a/docs/doc/fromDyalog.html b/docs/doc/fromDyalog.html index 1662a543..84928cca 100644 --- a/docs/doc/fromDyalog.html +++ b/docs/doc/fromDyalog.html @@ -4,10 +4,10 @@ BQN–Dyalog APL dictionary
(github) / BQN / doc
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BQN–Dyalog APL dictionary

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BQN–Dyalog APL dictionary

A few tables to help users of Dyalog APL (or similar) get started quickly on BQN. Here we assume ⎕ML is 1 for Dyalog.

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Terminology

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Array model

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Terminology

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Array model

BQN uses the based array model, so that a Dyalog simple scalar corresponds to many BQN values: an atom, its enclose, and so on.

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BQN shares the terms "cell" and "major cell" with Dyalog, and uses "element" (which may mean different things to different Dyalog users) not for a 0-cell but for the value it contains.

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Roles

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Roles

Dyalog uses value types (array, function, and so on) to determine syntax while BQN uses a separate concept called syntactic roles. See context-free grammar.

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Syntax

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Syntax

BQN comments are written with #, not ⍝. BQN strings use double quotes "" while single quotes '' enclose a character.

BQN's functions use {}, like Dyalog's dfns. The names for inputs and self-reference are different:

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BQN doesn't have guards: it uses modifiers or control structures instead. However, BQN function and modifier blocks have headers that allow pattern matching. See the block documentation.

The assignment arrow ← defines a new variable in a block, while ↩ modifies an existing one.

BQN uses the ligature character ‿ for stranding, instead of plain juxtaposition. It also has a list notation using ⟨⟩.

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For reading

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For reading

Here are some closest equivalents in Dyalog APL for the BQN functions that don't use the same glyphs as APL. Correspondence can be approximate, and ⌽ is just used as a decorator to mean "reverse some things".

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In BQN ⎉ is Rank and ∘ is Atop. Dyalog's Atop (⍤) and Over (⍥) were added in version 18.0.

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For writing

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For writing

The tables below give approximate implementations of Dyalog primitives for the ones that aren't the same. First- and last-axis pairs are also mostly omitted. BQN just has the first-axis form, and you can get the last-axis form with ⎉1.

The form F⍣G (Power with a function right operand; Power limit) must be implemented with recursion instead of primitives because it performs unbounded iteration. The modifier _while_ ← {𝔽⍟𝔾∘𝔽_𝕣_𝔾∘𝔽⍟𝔾𝕩} provides similar functionality without risk of stack overflow. It's discussed here and called as Fn _while_ Cond arg.

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