Language Features: Difference between revisions
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==System Variables== | ==System Variables== | ||
* [[Scalar System Variables]] (<apll>⎕CT</apll>, <apll>⎕IO</apll>, <apll>⎕PP</apll>, <apll>⎕PW</apll>, <apll>⎕RL</apll>) | * [[Scalar System Variables]] (<apll>⎕CT</apll>, <apll>⎕IO</apll>, <apll>⎕PP</apll>, <apll>⎕PW</apll>, <apll>⎕RL</apll>) | ||
* [[System Function ELX|<apll>⎕ELX</apll>]] (Error Trapping) | |||
* [[System Variable FC|<apll>⎕FC</apll>]] (Format Control) | * [[System Variable FC|<apll>⎕FC</apll>]] (Format Control) | ||
* [[System Variable IC|<apll>⎕IC</apll>]] (Indeterminate Control) | * [[System Variable IC|<apll>⎕IC</apll>]] (Indeterminate Control) | ||
Revision as of 01:20, 29 July 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).
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)
