NuVoc

Learn how to use this page Learn some special J terms Learn how to name J objects

Scroll down to a list of Ancillary Pages See a minimal subset of what's below Report a problem with these pages

J-90x Reference Cards:   File:B.USLETTER.pdf   File:B.A4.pdf

Earlier reference sources:   Usr  Pri  JfC  LJ  Phr  Dic  Voc  !:

Shortcuts:   Constants  Controls  Foreigns  Parts of Speech

−

KEY: Primitiv e Valence(s) COLOR CODE: Parts of Speech

= rank Monadic-name   •  Dyadic-name left-rank right-rank Verb Adverb Conjunction

_: monadic-rank  Dual-Valence-name  left-rank right-rank Noun Other Control

x y   Arguments of verbs
left / right u v   Verb or noun operands of modifiers
left / right m n   Noun operands of modifiers
left / right

0:

= _ Self-Classify • Equal  0 0 =. Is (Local) =: Is (Global)

< _  Box • Lesser  0 0 <. 0  Floor • Lesser of / Min  0 0 <: 0  Decrement • Lesser or Equal  0 0

> 0  Open • Greater  0 0 >. 0  Ceiling • Greater of / Max  0 0 >: 0  Increment • Greater or Equal  0 0

_ __ Negative Sign / Infinities _. Indeterminate _: __: _  Infinites  _ _

4:

+ 0  Conjugate • Plus  0 0 +. 0  Real / Imag • GCD (Or)  0 0 +: 0  Double • Not-Or  0 0

* 0  Signum • Times  0 0 *. 0  Length / Angle • LCM (And)  0 0 *: 0  Square • Not-And  0 0

- 0  Negate • Minus  0 0 -. 0  Not • Less  _ _ -: 0  Halve • Match  _ _

% 0  Reciprocal • Divide  0 0 %. 2  Matrix Inverse • Matrix Divide  _ 2 %: 0  Square Root • Root  0 0

8:

^
^!.p 0  Exponential
  • Power  0 0

Stope Function  0 0

^. 0  Natural Log • Logarithm  0 0 ^: _  Power of Verb  _ _

(If, Inverse, DoWhile)

$ _  Shape Of • Shape  1 _ $. _  Sparse  _ _ $: _  Self-Reference  _ _

u~
m~ _  Reflex •  Passive  lu ru
~. _  Nub •   ~: _   Nub Sieve • Not-Equal  0 0

0  Evoke  0 0

| 0  Magnitude • Residue  0 0 |.
|.!.f _  Reverse
_  Shift Right 1 • Rotate  _ _

Shift  _ _

|: _  Transpose • Rearrange Axes  1 _

12:

. 2  Determinant • Matrix Product  _ _

: Definition
(Explicit Def., Verb Anatomy, mu  Monad / Dyad  lv rv) :. mu  Assign Obverse  lu ru :: _  Assign Adverse  _ _

, _  Ravel • Append  _ _ ,. _  Ravel Items • Stitch  _ _ ,: _  Itemize • Laminate  _ _

; _  Raze • Link  _ _ ;. Cut ;: 1  Words • Seq. Machine  _ _

;.0 _  Reversed • Subarray  2 _

;.±1 ±2 _  SelfIntervals • Intervals  1 _

;.±3 _  MaxCubes • Subarrays  2 _

16:

# _  Tally • Copy  1 _ #. 1  Base Two • Base  1 1 #: _  Antibase Two • Antibase  1 0

! 0  Factorial • Out Of  0 0 !. mu  Fit (Customize)  lu ru !: 0  Foreign (System Functions)  0 0

/ _  Insert • Table  _ _ /.
/.. _  Oblique
  • Key  _ _
Key dyad  _ _ /: _  Grade Up • Sort Up [Using]  _ _

\ _  Prefix • Infix  _ _ \. _  Suffix • Outfix  _ _ \: _  Grade Down • Sort Down [Using]  _ _

20:

[ _  Same • Left  _ _ [. Lev [: Cap

] _  Same • Right  _ _ ]. Dex ]: Ident

{ 1  Catalogue • From  0 _ {. _  Head • Take  1 _ {: _  Tail • {:: _  Map • Fetch  1 _

} _  Composite Item • Amend  _ _ }. _  Behead • Drop  1 _ }: _  Curtail • {{ }} DirectDefinition

24:

" Rank
(u"n  Assign, m"n  Constant, u"v m"v  Copy) ". 1  Do • Numbers  _ _ ": _  Default Format • Format  1 _

` Tie (Gerund) `: _  Evoke Gerund  _ _

@ mv  Atop  lv rv m@.n mv  Select From Agenda  lv rv @: _  At  _ _

m@.v mv  Agent  mv mv

m&v u&n _  Bond •   &. mv  Under (Dual)  mv mv &: _  Appose  _ _ &.: _  Under  _ _

u&v mv  Compose  mv mv

? 0  Roll • Deal  0 0 ?. _  Roll • Deal  0 0 a. Alphabet (all bytes)

(fixed seed)

29:

a: Ace (Boxed Empty) A. 1  Anagram Index • Anagram  0 _ m b.
u b. _  Boolean, Bitwise, Bitwise Shift  0 0

_  Verb Info (Obverse, Rank, Identity)

c. • Convert to Precision  _ _ C.

C.!.2

1  Cycle-Direct

1  Permutation Parity

• Permute  1 _

 

e. _  Raze In • Member (In)  _ _

E. • Find Matches  _ _ f. Fix F. F.. F.:
F: F:. F:: _  Fold  _ _

H. 0  Hypergeometric  0 0 i. 1  Integers • Index Of  _ _ i: 0  Steps • Index Of Last  _ _

33:

I. 1  Indices • Interval Index  _ _ j. 0  Imaginary • Complex  0 0 L. _  Level Of •

L: _  Level At  _ _ m.   Modular arithmetic    M. mu  Memo  lu ru

NB. Comment o. 0  Pi Times • Circle Function  0 0 p. 1  Roots • Polynomial  1 0

p.. 1  Polynomial Deriv. • Polynomial Int.  0 1 p: 0  Primes  _ _ q: _  Prime Factors • Prime Exponents  0 0

37:

r. 0  Angle • Polar  0 0 s: _  Symbol  _ _ S: _  Spread  _ _

t. _  Run as task  _ _ T. _  Set debug thread • Threads/tasks  _ _ u: _  Unicode  _ _

x: _  Extended Precision  _ _ Z: _  Get Fold status • Terminate Fold  _ _ _9: to 9: _  Constant Functions  _ _

(u v) _  Hook  _ _ (f g h) _  Fork  _ _
Modifier trains u. v. _  u/v in caller's context  _ _

41:

assert. Assertion break. Terminate loop continue. Terminate iteration

else.
elseif. Execute alternative for.
for_ijk. Repeat for each item goto_lbl.
label_lbl. Go to label

if. Execute if return. Exit with result select.
case.
fcase. Select among alternatives

throw. Throw to higher-level catcht. try.
catch.
catchd.
catcht. Execute, catching errors while.
whilst. Loop while

45: obsolete

d. 0  Ordinary
Derivative • u D.
m D. mu  Derivative

mu  Assign Derivative

• D: • Secant Slope   mu mu

m&v u&n 0  PowerBond

Ancillary Pages

These are special articles written to comply with NuVoc standards, and tagged: Category:NuVoc.

They explain principles and practice in greater depth than appropriate on the primitives' pages themselves (all tagged: CategoryVoc), or which are relevant to more than one page.

They are task-oriented rather than function-oriented

• i.e. they describe features from the point-of-view of what the reader wants to achieve, rather than document J's functionality (as the primitive-pages do)

These pages are linked from the primitive-pages themselves, at the point where they are relevant.

But for convenient lookup and revision, they are listed below:

J Reference Sheets One Sheet J Reference pages for J602 and J90X

Vocabulary/AboutNuVoc About the Accessible Dictionary: how and why

Vocabulary/AccurateAccumulation +/!.0 y and x +/@:*"1!.0 y to avoid roundoff error

Vocabulary/AET "Absolutely essential J terms" to know for NuVoc

Vocabulary/Agreement How argument cells are matched for dyads (with tables)

Vocabulary/AmendingBoxedStructures Making replacements inside a boxed array

Vocabulary/ArrayProcessing How do you process an array? (an introduction)

Vocabulary/Assignment Private and public assignment explained

Vocabulary/Beginner's Q&A What a beginner needs to know, in brief

Vocabulary/Constants Number formation (an intro by examples)

Vocabulary/ControlStructures Control words used in J definitions

Vocabulary/CyclicGerund Cyclic gerunds explained

Vocabulary/Debug How to debug an explicit definition

Vocabulary/DirectDefinition Use {{ }} to write explicit definitions

Vocabulary/Dissect Pictorial view and analysis of a J sentence

Vocabulary/EZRank Rank in a hurry: "rank" concept rapidly explained

Vocabulary/EmptyArguments What happens when an argument to a verb has no atoms, or no cells (two different conditions!)

Vocabulary/ErrorMessages Error Messages (formal table plus explanations)

Vocabulary/Foreigns System Functions and Miscellaneous Features (m!:n)

Vocabulary/FramingFill Result collection and framing fill explained

Vocabulary/GerundsAndAtomicRepresentation Gerunds and Atomic Representation explained

Vocabulary/Glossary J terms (a comprehensive formal list)

Vocabulary/HowNuVoc   <--START HERE-- How to use NuVoc

Vocabulary/IFamily The i.-family of verbs described

Vocabulary/Idioms Common Idioms used in J best practice

Vocabulary/Inverses Inverse and Obverse explained

Vocabulary/JBreak JBreak: forcing J to stop executing the current process

Vocabulary/LAPACK J interface to the LAPACK library

Vocabulary/Lint How to use lint: the builtin Program Flow Analyzer

Vocabulary/Libraries The J Libraries and what they do

Vocabulary/Locales Locales explained

Vocabulary/Loopless Loopless programming explained: repeating a function on cells, partitions, subarrays, etc.

Vocabulary/Modifiers Modifiers (adverbs and conjunctions) explained

Vocabulary/ModifierTrains Rules and examples for using modifier trains such as ([.*].)

Vocabulary/NounExplicitDefinition How to define a noun as an explicit entity using (:)

Vocabulary/Nouns All about Nouns

Vocabulary/NumericPrecisions Numeric Precisions in J

Vocabulary/ObjectOrientedProgramming Object-Oriented Programming in J

Vocabulary/Parsing How sentences are executed, step by step

Vocabulary/PartsOfSpeech The Parts of Speech: Noun, Verb, etc. Call by name and call by value.

Guides/Performance Monitor Profile execution to find slow spots

Vocabulary/ObsoleteSyntax No-longer-supported features of earlier version of J, seen in some of the older references.

Vocabulary/Printf How to use the printf addon

Vocabulary/RankFromV The rank of a verb created by an adverb or conjunction

Vocabulary/RankInfo Rank Information linked from CategoryVoc pages

Vocabulary/RankInfoIsImportant Why is the rank of a verb important to know?

Vocabulary/ReadingASentence A beginner's guide to reading sentences

Guides/Regular Expressions/Overview Regex in J

Vocabulary/ScreenOutputInput Screen output and input explained

Vocabulary/SpecialCombinations Special Combinations of primitives (with tables)

Vocabulary/TBlock Clarification of the T-block and the B-block in an if.-statement

Vocabulary/TestYourJ Test Your J (tells you if you've any need of NuVoc)

Vocabulary/Unreadability The alleged unreadability of J - and what to do about it

Vocabulary/UnicodeCodePoint The Unicode Code Point (UCP) explained

Vocabulary/Valence Verb valence explained

Vocabulary/Verbs All about Verbs

Vocabulary/VerbRank Verb rank, and how J extends small verbs to big arrays

JDic:vocabul VOC - the original "pro version" of this portal page

Vocabulary/Words All about J Words

Vocabulary/ZeeLocale "Factory words" - the z-locale and its contents

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