Materialise

From APL Wiki
Revision as of 23:49, 9 July 2020 by Bubbler (talk | contribs) (Created page with "{{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 alrea...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

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 ∙ Round
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 ∙ Identity (Null, Ident)
Dyadic Bind ∙ Compositions (Compose, Reverse Compose, Beside, Withe, Atop, Over) ∙ Inner Product ∙ Determinant ∙ Power ∙ At ∙ Under ∙ Rank ∙ Depth ∙ Variant ∙ Stencil ∙ Cut ∙ Direct definition (operator) ∙ Identity (Lev, Dex)
Quad names Index origin ∙ Comparison tolerance ∙ Migration level ∙ Atomic vector
Retrieved from ‘https://aplwiki.com/index.php?title=Materialise&oldid=5093’