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{{Built- | {{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]]. | ||
== APL+Win settings == | == APL+Win settings == | ||
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| <source lang=apl inline>⎕ML=0</source> | | <source lang=apl inline>⎕ML=0</source> | ||
| <source lang=apl inline>Z←∊R</source> | | <source lang=apl inline>Z←∊R</source> | ||
| Monadic <source lang=apl inline>∊</source> is interpreted as [[ | | Monadic <source lang=apl inline>∊</source> is interpreted as [[Type]] rather than [[Enlist]]. | ||
|- | |- | ||
| <source lang=apl inline>⎕ML=1</source> | | <source lang=apl inline>⎕ML=1</source> | ||
| Line 20: | Line 20: | ||
| rowspan=3 | <source lang=apl inline>⎕ML≤2</source> | | rowspan=3 | <source lang=apl inline>⎕ML≤2</source> | ||
| <source lang=apl inline>Z←↑R</source> | | <source lang=apl inline>Z←↑R</source> | ||
| Monadic <source lang=apl inline>↑</source> is interpreted as [[ | | Monadic <source lang=apl inline>↑</source> is interpreted as [[First]] rather than [[Mix]]. | ||
|- | |- | ||
| <source lang=apl inline>Z←⊃R</source> | | <source lang=apl inline>Z←⊃R</source> | ||
| Monadic <source lang=apl inline>⊃</source> is interpreted as [[ | | Monadic <source lang=apl inline>⊃</source> is interpreted as [[Mix]] rather than [[First]]. | ||
|- | |- | ||
| <source lang=apl inline>Z←≡R</source> | | <source lang=apl inline>Z←≡R</source> | ||
| Line 30: | Line 30: | ||
| rowspan=2| <source lang=apl inline>⎕ML=3</source> | | rowspan=2| <source lang=apl inline>⎕ML=3</source> | ||
| <source lang=apl inline>R←X⊂[K]Y</source> | | <source lang=apl inline>R←X⊂[K]Y</source> | ||
| Dyadic <source lang=apl inline>⊂</source> is interpreted as [[ | | Dyadic <source lang=apl inline>⊂</source> is interpreted as [[Partition]] (<source lang=apl inline>⊆</source>) rather than [[Partitioned Enclose]]. | ||
|- | |- | ||
| <source lang=apl inline>⎕TC</source> | | <source lang=apl inline>⎕TC</source> | ||
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|} | |} | ||
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. | ||
== APLX settings == | |||
APLX treats the value as a collection of individual bits, thus allowing the combination of an exact set of behaviours: | |||
{|class=wikitable | |||
| <source lang=apl inline>⎕CS←1</source> || [[Strand notation|Stranding]] is done before [[bracket indexing]] | |||
|- | |||
| <source lang=apl inline>⎕CS←2</source> || The [[name class]] of an invalid name is 4 rather than ¯1. | |||
|- | |||
| <source lang=apl inline>⎕CS←4</source> || Format (<source lang=apl inline>⍕</source>) and default output uses the same width for all columns, rather than determining the width separately for each column. | |||
|} | |||
== External links == | == External links == | ||
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=== Documentation === | === Documentation === | ||
* [ | * [https://help.dyalog.com/latest/#Language/System%20Functions/ml.htm Dyalog] | ||
* [http://microapl.com/apl_help/ch_020_070_140.htm APLX] | |||
{{APL built-ins}} | {{APL built-ins}}[[Category:System constants]] | ||