Language Features: Difference between revisions
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* [[Point Notation]]: <ul><li>'''Base''' — <apll>16b10FFFF</apll> as a shorthand for <apll>16{base}1 0 15 15 15 15</apll></li><li>'''Pi''' — <apll>2p3</apll> as a shorthand for <apll>2π<sup>3</sup></apll> or <apll>2×(○1)*3</apll></li><li>'''Euler''' — <apll>2x3</apll> as a shorthand for <apll>2e<sup>3</sup></apll> or <apll>2×(*1)*3</apll>.</li></ul> | * [[Point Notation]]: <ul><li>'''Base''' — <apll>16b10FFFF</apll> as a shorthand for <apll>16{base}1 0 15 15 15 15</apll></li><li>'''Pi''' — <apll>2p3</apll> as a shorthand for <apll>2π<sup>3</sup></apll> or <apll>2×(○1)*3</apll></li><li>'''Euler''' — <apll>2x3</apll> as a shorthand for <apll>2e<sup>3</sup></apll> or <apll>2×(*1)*3</apll>.</li></ul> | ||
* [[Trains]]: e.g., <apll>avg←(+/ ÷ ⍴)</apll> applies the functions to its argument(s) in a particular way (in this case, to compute the average of a numeric vector). | * [[Trains]]: e.g., <apll>avg←(+/ ÷ ⍴)</apll> applies the functions to its argument(s) in a particular way (in this case, to compute the average of a numeric vector). | ||
* [[System Labels]]: <apll>⎕PROTOTYPE</apll> and <apll>⎕IDENTITY</apll> in user-defined functions/operators. | |||
==Primitive functions== | ==Primitive functions== | ||
Revision as of 19:02, 11 August 2009
At the moment, the following sections describe only those language features that are New or Enhanced relative to the Extended APL Standard, or that deserve special comment.
Syntax
- Strand Assignment: (A1 A2 ... An)←R
- Modify Assignment: Af←R
- Modify Strand Assignment: (A1 A2 ... An)f←R
- Function/Operator Assignment: A←f, A←op1, A←op2
- Sink: ←R
- Point Notation:
- Base — 16b10FFFF as a shorthand for 16⊥1 0 15 15 15 15
- Pi — 2p3 as a shorthand for 2π3 or 2×(○1)*3
- Euler — 2x3 as a shorthand for 2e3 or 2×(*1)*3.
- Trains: e.g., avg←(+/ ÷ ⍴) applies the functions to its argument(s) in a particular way (in this case, to compute the average of a numeric vector).
- System Labels: ⎕PROTOTYPE and ⎕IDENTITY in user-defined functions/operators.
Primitive functions
- Index Generator: ⍳R
- Index Of: L⍳R
- Indexing: R[L], R[L]←A, R[L]f←A, L⌷R, L⍉R L⊃R
- Matrix Inverse/Divide: ⌹R, L⌹R
- Without: L~R
- Partitioned Enclose: L⊂R
Primitive operators
- Axis: f[X], f op1[X], f op2[X]g
- Composition: f∘g, f∘R, L∘g
- Null: f⊙
- Rank: f⍤[X] Y
Datatypes
- Infinity: ∞ and ¯∞
- Arithmetic Progression Arrays: 2 3 4⍴⍳24
- Unicode Characters
- Array Predicates
System Functions
- ⎕A (Alphabet)
- ⎕AV (Atomic Vector)
- ⎕CR (Canonical Representation)
- ⎕DM (Diagnostic Message)
- ⎕DR (Data Representation)
- ⎕ERROR (Error Signal)
- ⎕FMT (Format)
- ⎕MF (Monitor Functions)
- ⎕NL (Name List)
- ⎕SIZE (Object Size)
- ⎕SYSID (System Identifier)
- ⎕SYSVER (System Version)
- ⎕TC/⎕TCxxx (Terminal Control)
- ⎕TF (Transfer Form)
- ⎕TYPE (Prototype)
- ⎕UCS (Universal Character Set)
- ⎕VR (Visual Representation)
- ⎕WA (Workspace Available)
System Variables
- Scalar System Variables (⎕CT, ⎕IO, ⎕PP, ⎕PW, ⎕RL)
- ⎕ELX (Error Trapping)
- ⎕FC (Format Control)
- ⎕IC (Indeterminate Control)
