Statement separator: Difference between revisions

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In Iverson's Dictionary of APL <ref>[[Kenneth E. Iverson|Iverson, Kenneth]]. [https://www.jsoftware.com/papers/APLDictionary1.htm#3e "Dictionary of APL"]. [[Sansom]] 1987.</ref> he states "expressions using the statement separator <syntaxhighlight lang=apl inline>⋄</syntaxhighlight> can be mimicked by expressions using the verb left [[Identity]]. The primary difference is that the separation imposed by <syntaxhighlight lang=apl inline>⊣</syntaxhighlight> follows the normal rules for order of execution."  
In Iverson's Dictionary of APL <ref>[[Kenneth E. Iverson|Iverson, Kenneth]]. [https://www.jsoftware.com/papers/APLDictionary1.htm#3e "Dictionary of APL"]. [[Sansom]] 1987.</ref> he states "expressions using the statement separator <syntaxhighlight lang=apl inline>⋄</syntaxhighlight> can be mimicked by expressions using the verb left [[Identity]]. The primary difference is that the separation imposed by <syntaxhighlight lang=apl inline>⊣</syntaxhighlight> follows the normal rules for order of execution."  


[[APL/700]] uses a semicolon to achieve the same effect as the left tack <syntaxhighlight lang=apl inline>⊣</syntaxhighlight>.
As an example [[APL/700]] uses a semicolon to achieve the same effect as the left tack <syntaxhighlight lang=apl inline>⊣</syntaxhighlight>.


According to the Sharp APL Reference Manual<ref>[[Paul Berry|Berry, Paul]]. [https://archive.org/details/sharp-apl-reference-manual_202108 "Sharp APL Reference Manual"]. [[IP Sharp]] 1987.</ref> [[branching]] <syntaxhighlight lang=apl inline>→</syntaxhighlight> takes precedence over statement separators. ie "If the expression to the right of the branch is not empty, the system goes immediately to the line whose number is the first element in that expression"  
According to the Sharp APL Reference Manual<ref>[[Paul Berry|Berry, Paul]]. [https://archive.org/details/sharp-apl-reference-manual_202108 "Sharp APL Reference Manual"]. [[IP Sharp]] 1987.</ref> [[branching]] <syntaxhighlight lang=apl inline>→</syntaxhighlight> takes precedence over statement separators. ie "If the expression to the right of the branch is not empty, the system goes immediately to the line whose number is the first element in that expression"  

Revision as of 23:13, 10 November 2022

Statement Separator ⋄ often called by the name of its glyph Diamond, allows you to place multiple statements on a single line. It works both inside a function and directly within the interpreter. Statement separators can be empty.

It is important to note that using a Statement Separator ⋄ forces the interpreter to read from left to right. Each separated statement will be read as if it is on it's own line.

In Iverson's Dictionary of APL [1] he states "expressions using the statement separator ⋄ can be mimicked by expressions using the verb left Identity. The primary difference is that the separation imposed by ⊣ follows the normal rules for order of execution."

As an example APL/700 uses a semicolon to achieve the same effect as the left tack ⊣.

According to the Sharp APL Reference Manual[2] branching → takes precedence over statement separators. ie "If the expression to the right of the branch is not empty, the system goes immediately to the line whose number is the first element in that expression"

When tracing errors within a line containing statement separators ⋄, statements to the right of the caret have not yet been executed.

Statement separators to the right of a comment ⍝ are ignored.

Examples

Statements are read from left to right: 

A←10 ⋄ A←A×3 ⋄ A÷2 
15

External links

Documentation

References

  1. ↑ Iverson, Kenneth. "Dictionary of APL". Sansom 1987.
  2. ↑ Berry, Paul. "Sharp APL Reference Manual". IP Sharp 1987.
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
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