Bind: Difference between revisions

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{{Built-in|Bind|∘}} is a [[primitive operator]]. It shares the glyph [[Jot]] (<source lang=apl inline>∘</source>) with [[Beside]]; in many dialects the two operators share the name [[Compose]]. Its [[derived function]]s can only be called monadically.
{{Built-in|Bind|∘}} is a [[primitive operator]]. It shares the glyph [[Jot]] (<source lang=apl inline>∘</source>) with [[Beside]]; in many dialects the two operators share the name [[Compose]]. Its [[derived function]]s can only be called monadically.


Called with an array left operand <source lang=apl inline>A</source> and function right operand <source lang=apl inline>g</source>, <source lang=apl inline>(A∘f) X</source> is equivalent to <source lang=apl inline>A f X</source>.
Called with an array left operand <source lang=apl inline>A</source> and function right operand <source lang=apl inline>g</source>, <source lang=apl inline>(A∘g) X</source> is equivalent to <source lang=apl inline>A g X</source>.


Called with a function left operand <source lang=apl inline>f</source> and array right operand <source lang=apl inline>B</source>, <source lang=apl inline>(f∘B) X</source> is equivalent to <source lang=apl inline>X f B</source>.
Called with a function left operand <source lang=apl inline>f</source> and array right operand <source lang=apl inline>B</source>, <source lang=apl inline>(f∘B) X</source> is equivalent to <source lang=apl inline>X f B</source>.

Revision as of 08:35, 26 March 2022

Bind () is a primitive operator. It shares the glyph Jot () with Beside; in many dialects the two operators share the name Compose. Its derived functions can only be called monadically.

Called with an array left operand A and function right operand g, (Ag) X is equivalent to A g X.

Called with a function left operand f and array right operand B, (fB) X is equivalent to X f B.

Common usage

Bind is used to create a derived function with a single constant argument, particularly in tacit programming:

Try it online!

      Inc+1
      Inc 1 2 3
2 3 4

External links

Lessons

Documentation


APL built-ins [edit]
Primitive functions
Scalar
Monadic ConjugateNegateSignumReciprocalMagnitudeExponentialNatural LogarithmFloorCeilingFactorialNotPi TimesRollTypeImaginarySquare Root
Dyadic AddSubtractTimesDivideResiduePowerLogarithmMinimumMaximumBinomialComparison functionsBoolean functions (And, Or, Nand, Nor) ∙ GCDLCMCircularComplexRoot
Non-Scalar
Structural ShapeReshapeTallyDepthRavelEnlistTableCatenateReverseRotateTransposeRazeMixSplitEncloseNestCut (K)PairLinkPartitioned EnclosePartition
Selection FirstPickTakeDropUniqueIdentitySelectReplicateExpandSet functions (IntersectionUnionWithout) ∙ Bracket indexingIndex
Selector Index generatorGradeIndex OfInterval IndexIndicesDeal
Computational MatchNot MatchMembershipFindNub SieveEncodeDecodeMatrix InverseMatrix DivideFormatExecuteMaterialiseRange
Primitive operators Monadic EachCommuteConstantReplicateExpandReduceWindowed ReduceScanOuter ProductKeyI-BeamSpawnFunction axis
Dyadic BindCompositions (Compose, Reverse Compose, Beside, Withe, Atop, Over) ∙ Inner ProductPowerAtUnderRankDepthVariantStencilCut (J)
Quad names
Arrays Index originMigration levelAtomic vector
Functions Name classCase convertUnicode convert
Operators SearchReplace