Migration level: Difference between revisions

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Migration level (view source)

Revision as of 17:40, 20 February 2024

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{{Built-ins3|Migration level|⎕ML|⎕EL|⎕CS}}, '''Evolution level''', or '''Compatibility setting''' is a number that, in [[Dyalog APL]], [[APL+Win]], and [[APLX]] respectively, specifies exact behaviour relative to [[APL2]]. In Dyalog APL and APL+Win, a lower value represents a behaviour closer to the original [[NARS]] specification, while a higher the value represents a behaviour closer to APL2. In APLX, a lower value matches APL2 while a higher value indicates higher [[backwards compatibility]] with [[APL.68000]].
{{Built-ins3|Migration level|⎕ML|)EvLevel|⎕CS}}, '''Evolution level''', or '''Compatibility setting''' is a number that, in [[Dyalog APL]], [[APL+Win]], and [[APLX]] respectively, specifies exact behaviour relative to [[APL2]]. In Dyalog APL and APL+Win, a lower value represents a behaviour closer to the original [[NARS]] specification, while a higher the value represents a behaviour closer to APL2. In APLX, a lower value matches APL2 while a higher value indicates higher [[backwards compatibility]] with [[APL.68000]].


== APL+Win settings ==
== APL+Win settings ==


[TBD]
APL+Win's default is <syntaxhighlight lang=apl inline>)EvLevel 2</syntaxhighlight>.
 
{|class=wikitable
! Feature
! <syntaxhighlight lang=apl inline>)EvLevel 0</syntaxhighlight>
! <syntaxhighlight lang=apl inline>)EvLevel 1</syntaxhighlight>
! <syntaxhighlight lang=apl inline>)EvLevel 2</syntaxhighlight>
|-
| Dyadic <syntaxhighlight lang=apl inline>⊂</syntaxhighlight>
| [[EVOLUTION ERROR]]
| [[Partitioned Enclose]]
| [[Partition]]
|-
| Monadic <syntaxhighlight lang=apl inline>↓</syntaxhighlight>
| [[EVOLUTION ERROR]]
| [[Split]]
| [[SYNTAX ERROR]]
|-
| Monadic <syntaxhighlight lang=apl inline>∊</syntaxhighlight>
| [[EVOLUTION ERROR]]
| [[Type]]
| [[Enlist]]
|-
| Monadic <syntaxhighlight lang=apl inline>↑</syntaxhighlight>
| [[EVOLUTION ERROR]]
| [[Mix]]
| [[First]]
|-
| Monadic <syntaxhighlight lang=apl inline>⊃</syntaxhighlight>
| [[EVOLUTION ERROR]]
| [[First]]
| [[Mix]]
|-
| [[Bracket indexing]] of a [[strand]]
| [[EVOLUTION ERROR]]
| indexing applied to strand as a whole
| [[EVOLUTION ERROR]]
|-
| Unparenthesised [[strand]] [[assignment]]
| [[EVOLUTION ERROR]]
| assigned value distributed to names
| [[EVOLUTION ERROR]]
|-
| <syntaxhighlight lang=apl inline>(/)</syntaxhighlight>
| [[EVOLUTION ERROR]]
| [[Replicate]] [[function]]
| [[EVOLUTION ERROR]]
|-
| <syntaxhighlight lang=apl inline>(\)</syntaxhighlight>
| [[EVOLUTION ERROR]]
| [[Expand]] [[function]]
| [[EVOLUTION ERROR]]
|}
 
=== Work-arounds ===
 
APL+Win provides [[system function]] alternatives to the functions that are affected by moving to evolution level 2:
 
{|class=wikitable
| [[Partitioned Enclose]]
| <syntaxhighlight lang=apl inline>⎕PENCLOSE</syntaxhighlight>
|-
| [[Split]]
| <syntaxhighlight lang=apl inline>⎕SPLIT</syntaxhighlight>
|-
| [[Type]]
| <syntaxhighlight lang=apl inline>⎕TYPE</syntaxhighlight>
|-
| [[Mix]]
| <syntaxhighlight lang=apl inline>⎕MIX</syntaxhighlight>
|-
| [[First]]
| <syntaxhighlight lang=apl inline>⎕FIRST</syntaxhighlight>
|-
| [[Replicate]] [[function]]
| <syntaxhighlight lang=apl inline>⎕REPL</syntaxhighlight>
|-
| [[Expand]] [[function]]
| <syntaxhighlight lang=apl inline>⎕EXPAND</syntaxhighlight>
|}


== Dyalog settings ==
== Dyalog settings ==


Dyalog APL currently offers the following settings:
Dyalog's default setting is currently <syntaxhighlight lang=apl inline>⎕ML=1</syntaxhighlight>.


{| class=wikitable
{| class=wikitable
| <syntaxhighlight lang=apl inline>⎕ML=0</syntaxhighlight>
! Feature !! <syntaxhighlight lang=apl inline>⎕ML←0</syntaxhighlight> !! <syntaxhighlight lang=apl inline>⎕ML←1</syntaxhighlight> !! <syntaxhighlight lang=apl inline>⎕ML←2</syntaxhighlight> !! <syntaxhighlight lang=apl inline>⎕ML←3</syntaxhighlight>
| <syntaxhighlight lang=apl inline>Z←∊R</syntaxhighlight>
|-
| Monadic <syntaxhighlight lang=apl inline>∊</syntaxhighlight> is interpreted as [[Type]] rather than [[Enlist]].
| Monadic <syntaxhighlight lang=apl inline>∊</syntaxhighlight>
| [[Type]]
| [[Enlist]]
| [[Enlist]]
| [[Enlist]]
|-
|-
| <syntaxhighlight lang=apl inline>⎕ML=1</syntaxhighlight>
| Monadic <syntaxhighlight lang=apl inline>↑</syntaxhighlight>
|  
| [[Mix]]
| Default behaviour
| [[Mix]]
| [[First]]
| [[First]]
|-
|-
| rowspan=3 | <syntaxhighlight lang=apl inline>⎕ML≥2</syntaxhighlight>
| Monadic <syntaxhighlight lang=apl inline>⊃</syntaxhighlight>
| <syntaxhighlight lang=apl inline>Z←↑R</syntaxhighlight>
| [[First]]
| Monadic <syntaxhighlight lang=apl inline>↑</syntaxhighlight> is interpreted as [[First]] rather than [[Mix]].
| [[First]]
| [[Mix]]
| [[Mix]]
|-
|-
| <syntaxhighlight lang=apl inline>Z←⊃R</syntaxhighlight>
| Monadic <syntaxhighlight lang=apl inline>≡</syntaxhighlight> on array of uneven [[depth]]
| Monadic <syntaxhighlight lang=apl inline>⊃</syntaxhighlight> is interpreted as [[Mix]] rather than [[First]].
| negative result
| negative result
| positive result
| positive result
|-  
|-  
| <syntaxhighlight lang=apl inline>Z←≡R</syntaxhighlight>
| Dyadic <syntaxhighlight lang=apl inline>⊂</syntaxhighlight>
| Monadic <syntaxhighlight lang=apl inline>≡</syntaxhighlight> returns a positive rather than a negative value, if its argument has non-uniform [[depth]].
| [[Partitioned enclose]]
| [[Partitioned enclose]]
| [[Partitioned enclose]]
| [[Partition]]
|-
|-
| rowspan=2| <syntaxhighlight lang=apl inline>⎕ML=3</syntaxhighlight>
| <syntaxhighlight lang=apl inline>R←X⊂[K]Y</syntaxhighlight>
| Dyadic <syntaxhighlight lang=apl inline>⊂</syntaxhighlight> is interpreted as [[Partition]] (<syntaxhighlight lang=apl inline>⊆</syntaxhighlight>) rather than [[Partitioned Enclose]].
|-
| <syntaxhighlight lang=apl inline>⎕TC</syntaxhighlight>
| <syntaxhighlight lang=apl inline>⎕TC</syntaxhighlight>
| The order of the elements of <syntaxhighlight lang=apl inline>⎕TC</syntaxhighlight> is the same as in APL2.
| <syntaxhighlight lang=apl inline>⎕UCS 8 10 13</syntaxhighlight>
| <syntaxhighlight lang=apl inline>⎕UCS 8 10 13</syntaxhighlight>
| <syntaxhighlight lang=apl inline>⎕UCS 8 10 13</syntaxhighlight>
| <syntaxhighlight lang=apl inline>⎕UCS 8 13 10</syntaxhighlight>
|}
|}


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| <syntaxhighlight lang=apl inline>⎕ML=0</syntaxhighlight>
| <syntaxhighlight lang=apl inline>⎕ML=0</syntaxhighlight>
| <syntaxhighlight lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</syntaxhighlight>
| <syntaxhighlight lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '∊'⎕R'&' 'Epsilon'</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '∊'⎕R'&' ' Epsilon '</syntaxhighlight>
|-
|-
| <syntaxhighlight lang=apl inline>⎕ML=2</syntaxhighlight>
| <syntaxhighlight lang=apl inline>⎕ML=2</syntaxhighlight>
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EqualUnderbar←|≡
EqualUnderbar←|≡
</syntaxhighlight>
</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡'⎕R'&' ' UpArrow ' ' RightShoe ' ' EqualUnderbar '</syntaxhighlight>
|-
|-
| <syntaxhighlight lang=apl inline>⎕ML=3</syntaxhighlight>
| <syntaxhighlight lang=apl inline>⎕ML=3</syntaxhighlight>
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quadTC←(⎕UCS 8 13 10)
quadTC←(⎕UCS 8 13 10)
</syntaxhighlight>
</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar' 'LeftShoe' ' quadTC'</syntaxhighlight>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' ' UpArrow ' ' RightShoe ' ' EqualUnderbar ' ' LeftShoe ' ' quadTC '</syntaxhighlight>
|}
|}
Alternatively, the definitions can be used directly inside the text substitutions, whereby one avoids polluting existing code with these cover names.
Alternatively, the definitions can be used directly inside the text substitutions, whereby one avoids polluting existing code with these cover names.
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