Materialise: Difference between revisions

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{{Built-in|Materialise|⌷}} is a [[monadic]] [[primitive function]] which tries to cast the [[argument]] (which can be any object) into an APL array. If the argument is already an array, it is returned unmodified. It is only available in [[Dyalog APL]], which supports classes and .NET objects. Materialise shares its [[glyph]] <source lang=apl inline>⌷</syntaxhighlight> with [[Index (function)|Index]].
{{Built-in|Materialise|⌷}} is a [[monadic]] [[primitive function]] which tries to cast the [[argument]] (which can be any object) into an APL array. If the argument is already an array, it is returned unmodified. It is only available in [[Dyalog APL]], which supports classes and .NET objects. Materialise shares its [[glyph]] <syntaxhighlight lang=apl inline>⌷</syntaxhighlight> with [[Index (function)|Index]].


== Examples ==
== Examples ==
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Dyalog APL allows the user to define a class, which looks like the following:
Dyalog APL allows the user to define a class, which looks like the following:


<source lang=apl>
<syntaxhighlight lang=apl>
:Class cl
:Class cl
     :Property Default thing
     :Property Default thing
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If one property is declared as default, Materialise returns the value of the default property.
If one property is declared as default, Materialise returns the value of the default property.


<source lang=apl>
<syntaxhighlight lang=apl>
       ⊢cl  ⍝ It is an object
       ⊢cl  ⍝ It is an object
#.cl
#.cl
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Materialise can also be used on a .NET collection, which returns the underlying array of data.
Materialise can also be used on a .NET collection, which returns the underlying array of data.


<source lang=apl>
<syntaxhighlight lang=apl>
       ba←⎕NEW System.Collections.BitArray(⊂1 0 1 1 0)
       ba←⎕NEW System.Collections.BitArray(⊂1 0 1 1 0)
       ⍬≡⍴ba  ⍝ ba itself is a scalar object
       ⍬≡⍴ba  ⍝ ba itself is a scalar object
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Materialise is the same as [[Identity]] for APL arrays.
Materialise is the same as [[Identity]] for APL arrays.


<source lang=apl>
<syntaxhighlight lang=apl>
       (⌷≡⊢) 1 2 3 4 5
       (⌷≡⊢) 1 2 3 4 5
1
1

Latest revision as of 21:51, 10 September 2022

⌷

Materialise (⌷) is a monadic primitive function which tries to cast the argument (which can be any object) into an APL array. If the argument is already an array, it is returned unmodified. It is only available in Dyalog APL, which supports classes and .NET objects. Materialise shares its glyph ⌷ with Index.

Examples

Dyalog APL allows the user to define a class, which looks like the following: 

:Class cl
    :Property Default thing
    :Access Public Shared
        ∇ r←get
          r←3 1 4 1 4
        ∇
    :EndProperty
:EndClass
Works in: Dyalog APL

If one property is declared as default, Materialise returns the value of the default property. 

      ⊢cl  ⍝ It is an object
#.cl
      ⌷cl  ⍝ ⌷ casts cl to an array by getting the default property
3 1 4 1 4
      cl.thing  ⍝ Actual effect of the line above
3 1 4 1 4
Works in: Dyalog APL

Materialise can also be used on a .NET collection, which returns the underlying array of data. 

      ba←⎕NEW System.Collections.BitArray(⊂1 0 1 1 0)
      ⍬≡⍴ba  ⍝ ba itself is a scalar object
1
      ⍴⌷ba  ⍝ but it is actually a container of 5 values
5
Works in: Dyalog APL

Materialise is the same as Identity for APL arrays. 

      (⌷≡⊢) 1 2 3 4 5
1
Works in: Dyalog APL

External links

Tutorials

Documentation


APL built-ins [edit]
Primitives (Timeline) Functions
Scalar
Monadic Conjugate ∙ Negate ∙ Signum ∙ Reciprocal ∙ Magnitude ∙ Exponential ∙ Natural Logarithm ∙ Floor ∙ Ceiling ∙ Factorial ∙ Not ∙ Pi Times ∙ Roll ∙ Type ∙ Imaginary ∙ Square Root
Dyadic Add ∙ Subtract ∙ Times ∙ Divide ∙ Residue ∙ Power ∙ Logarithm ∙ Minimum ∙ Maximum ∙ Binomial ∙ Comparison functions ∙ Boolean functions (And, Or, Nand, Nor) ∙ GCD ∙ LCM ∙ Circular ∙ Complex ∙ Root
Non-Scalar
Structural Shape ∙ Reshape ∙ Tally ∙ Depth ∙ Ravel ∙ Enlist ∙ Table ∙ Catenate ∙ Reverse ∙ Rotate ∙ Transpose ∙ Raze ∙ Mix ∙ Split ∙ Enclose ∙ Nest ∙ Cut (K) ∙ Pair ∙ Link ∙ Partitioned Enclose ∙ Partition
Selection First ∙ Pick ∙ Take ∙ Drop ∙ Unique ∙ Identity ∙ Stop ∙ Select ∙ Replicate ∙ Expand ∙ Set functions (Intersection ∙ Union ∙ Without) ∙ Bracket indexing ∙ Index ∙ Cartesian Product ∙ Sort
Selector Index generator ∙ Grade ∙ Index Of ∙ Interval Index ∙ Indices ∙ Deal ∙ Prefix and suffix vectors
Computational Match ∙ Not Match ∙ Membership ∙ Find ∙ Nub Sieve ∙ Encode ∙ Decode ∙ Matrix Inverse ∙ Matrix Divide ∙ Format ∙ Execute ∙ Materialise ∙ Range
Operators Monadic Each ∙ Commute ∙ Constant ∙ Replicate ∙ Expand ∙ Reduce ∙ Windowed Reduce ∙ Scan ∙ Outer Product ∙ Key ∙ I-Beam ∙ Spawn ∙ Function axis
Dyadic Bind ∙ Compositions (Compose, Reverse Compose, Beside, Withe, Atop, Over) ∙ Inner Product ∙ Determinant ∙ Power ∙ At ∙ Under ∙ Rank ∙ Depth ∙ Variant ∙ Stencil ∙ Cut ∙ Direct definition (operator)
Quad names Index origin ∙ Comparison tolerance ∙ Migration level ∙ Atomic vector
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