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Migration level (view source)

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{{Built-ins|Migration level|⎕ML|⎕EL}} or Evolution level is a number that, in [[Dyalog APL]] and [[APL+Win]] respectively, determines exact where the original [[NARS]] specification and the current [[APL2]] implementation differ. A lower value represents a behaviour closer to NARS, while a higher the value represents a behaviour closer to APL2.
{{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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{| class=wikitable
{| class=wikitable
| <source lang=apl inline>⎕ML=0</source>
| <syntaxhighlight lang=apl inline>⎕ML=0</syntaxhighlight>
| <source lang=apl inline>Z←∊R</source>
| <syntaxhighlight lang=apl inline>Z←∊R</syntaxhighlight>
| Monadic <source lang=apl inline>∊</source> is interpreted as [[type]] rather than [[enlist]].
| Monadic <syntaxhighlight lang=apl inline>∊</syntaxhighlight> is interpreted as [[Type]] rather than [[Enlist]].
|-
|-
| <source lang=apl inline>⎕ML=1</source>
| <syntaxhighlight lang=apl inline>⎕ML=1</syntaxhighlight>
|  
|  
| Default behaviour
| Default behaviour
|-
|-
| rowspan=3 | <source lang=apl inline>⎕ML≤2</source>
| rowspan=3 | <syntaxhighlight lang=apl inline>⎕ML≥2</syntaxhighlight>
| <source lang=apl inline>Z←↑R</source>
| <syntaxhighlight lang=apl inline>Z←↑R</syntaxhighlight>
| Monadic <source lang=apl inline>↑</source> is interpreted as [[first]] rather than [[mix]].
| Monadic <syntaxhighlight lang=apl inline>↑</syntaxhighlight> is interpreted as [[First]] rather than [[Mix]].
|-
|-
| <source lang=apl inline>Z←⊃R</source>
| <syntaxhighlight lang=apl inline>Z←⊃R</syntaxhighlight>
| Monadic <source lang=apl inline>⊃</source> is interpreted as [[mix]] rather than [[first]].
| Monadic <syntaxhighlight lang=apl inline>⊃</syntaxhighlight> is interpreted as [[Mix]] rather than [[First]].
|-  
|-  
| <source lang=apl inline>Z←≡R</source>
| <syntaxhighlight lang=apl inline>Z←≡R</syntaxhighlight>
| Monadic <source lang=apl inline>≡</source> returns a positive rather than a negative value, if its argument has non-uniform [[depth]].
| Monadic <syntaxhighlight lang=apl inline>≡</syntaxhighlight> returns a positive rather than a negative value, if its argument has non-uniform [[depth]].
|-
|-
| rowspan=2| <source lang=apl inline>⎕ML=3</source>
| rowspan=2| <syntaxhighlight lang=apl inline>⎕ML=3</syntaxhighlight>
| <source lang=apl inline>R←X⊂[K]Y</source>
| <syntaxhighlight lang=apl inline>R←X⊂[K]Y</syntaxhighlight>
| Dyadic <source lang=apl inline>⊂</source> is interpreted as [[partition]] (<source lang=apl inline>⊆</source>) rather than [[partitioned enclose]].
| Dyadic <syntaxhighlight lang=apl inline>⊂</syntaxhighlight> is interpreted as [[Partition]] (<syntaxhighlight lang=apl inline>⊆</syntaxhighlight>) rather than [[Partitioned Enclose]].
|-  
|-  
| <source lang=apl inline>⎕TC</source>
| <syntaxhighlight lang=apl inline>⎕TC</syntaxhighlight>
| The order of the elements of <source lang=apl inline>⎕TC</source> is the same as in APL2.
| The order of the elements of <syntaxhighlight lang=apl inline>⎕TC</syntaxhighlight> is the same as in APL2.
|}
|}


== Work-arounds ==
=== Work-arounds ===
When migrating to Dyalog APL, the below drop-ins for the affected [[built-ins]] allow setting <source lang=apl inline>⎕ML←1</source> while preserving code behaviour. It is then safe to programmatically (as shown in the rightmost column) change all occurrences of the affected built-ins with their respective covers.
When migrating to Dyalog APL, the below drop-ins for the affected [[built-ins]] allow setting <syntaxhighlight lang=apl inline>⎕ML←1</syntaxhighlight> while preserving code behaviour. It is then safe to programmatically (as shown in the rightmost column) change all occurrences of the affected built-ins with their respective covers.


{| class=wikitable
{| class=wikitable
! Migrating from !! Define !! Then run this on all code
! Migrating from !! Define !! Then run this on all code
|-
|-
| <source lang=apl inline>⎕ML=0</source>
| <syntaxhighlight lang=apl inline>⎕ML=0</syntaxhighlight>
| <source lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</source>
| <syntaxhighlight lang=apl>Epsilon←{×⎕NC'⍺':⍺∊⍵ ⋄ ⊃0⍴⊂⍵}</syntaxhighlight>
| <source lang=apl inline>'''[^'']+''' '∊'⎕R'&' 'Epsilon'</source>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '∊'⎕R'&' 'Epsilon'</syntaxhighlight>
|-
|-
| <source lang=apl inline>⎕ML=2</source>
| <syntaxhighlight lang=apl inline>⎕ML=2</syntaxhighlight>
| <source lang=apl>
| <syntaxhighlight lang=apl>
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
EqualUnderbar←|≡
EqualUnderbar←|≡
</source>
</syntaxhighlight>
| <source lang=apl inline>'''[^'']+''' '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'</source>
| <syntaxhighlight lang=apl inline>'''[^'']+''' '↑' '⊃' '≡'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar'</syntaxhighlight>
|-
|-
| <source lang=apl inline>⎕ML=3</source>
| <syntaxhighlight lang=apl inline>⎕ML=3</syntaxhighlight>
| <source lang=apl>
| <syntaxhighlight lang=apl>
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
UpArrow←{×⎕NC'⍺':⍺↑⍵ ⋄ ⊃⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
RightShoe←{×⎕NC'⍺':⍺↑⍵ ⋄ ↑⍵}
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LeftShoe←{×⎕NC'⍺':⍺⊆⍵ ⋄ ⊂⍵}
LeftShoe←{×⎕NC'⍺':⍺⊆⍵ ⋄ ⊂⍵}
quadTC←(⎕UCS 8 13 10)
quadTC←(⎕UCS 8 13 10)
</source>
</syntaxhighlight>
| <source lang=apl inline>'''[^'']+''' '↑' '⊃' '≡' '⊂' '⎕TC'⎕R'&' 'UpArrow' 'RightShoe' 'EqualUnderbar' 'LeftShoe' ' quadTC'</source>
| <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.
== APLX settings ==
APLX treats the value as a collection of individual bits, thus allowing the combination of an exact set of behaviours:
{|class=wikitable
| <syntaxhighlight lang=apl inline>⎕CS←1</syntaxhighlight> || [[Strand notation|Stranding]] is done before [[bracket indexing]]
|-
| <syntaxhighlight lang=apl inline>⎕CS←2</syntaxhighlight> || The [[name class]] of an invalid name is 4 rather than ¯1.
|-
| <syntaxhighlight lang=apl inline>⎕CS←4</syntaxhighlight> || Format (<syntaxhighlight lang=apl inline>⍕</syntaxhighlight>) 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 ===


* [http://help.dyalog.com/latest/#Language/System%20Functions/ml.htm Dyalog]
* [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}}{{APL glyphs}}[[Category:System constants]]
Retrieved from ‘https://aplwiki.com/wiki/Special:MobileDiff/1310...9590’

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